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1995 | Buch

Introduction Kapitel lesen Erstes Kapitel lesen

Load-Oriented Manufacturing Control

verfasst von: Hans-Peter Wiendahl

Verlag: Springer Berlin Heidelberg

Enthalten in: Professional Book Archive

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Über dieses Buch

Load-Oriented Manufacturing Control is unique as it gives comprehensive and self-contained principles for the implementation of an appropriate production control technique of general applicability. It is based on the "funnel model", a new approach to scheduling and scheduling control which has an extensive monitoring and diagnosis system. Its most important system components include throughput diagrams, load-oriented order release, schedule-oriented capacity planning and control. The "funnel model" is getting increasing implementation in manufacturing companies. It is available in numerous variants and is especially significant for the job-shop and series production. Load-Oriented Manufacturing Control provides a large number of practical examples and is therefore relatively easy to understand. It offers direct implementation of this new important technique in manufacturing scheduling and control.

Inhaltsverzeichnis

Frontmatter
Chapter 1. Introduction
Abstract
Many advances have been made in manufacturing management in the last thirty or forty years. These improvements originated in many different areas, and included such concepts as Manufacturing Resource Planning (MRP II), Statistical Process Control (SPC), Group Technology (GT), the Just-In-Time Approach (JIT), the Theory of Constraints (TOC), and Total Quality Management (TQM). These advances usually built on earlier concepts, utilizing their strengths while introducing new ideas to meet unsolved challenges. This work follows that pattern. The first two chapters discuss the present status of manufacturing management and the challenges that exist. The chapters which follow describe an approach that has overcome many of these challenges in a broad range of manufacturing settings.
Hans-Peter Wiendahl
Chapter 2. Conventional Production Scheduling and Control
Abstract
After a brief description of the well known MRP II concept, this chapter concentrates on the way in which allowances for shop orders are determined in backward and capacity scheduling processes. It then analyses the weak points of conventional procedures and develops a set of requirements for a better method of order scheduling.
Hans-Peter Wiendahl
Chapter 3. Lead Time — A Key Term in Manufacturing Control
Abstract
Work center lead time and order lead time are the basic elements for the systematics of production planning and control. A precise definition of these terms is therefore given first, and the difference between simple and weighted values is explained. The formulas and tables necessary to compute statistical values for the evaluation of recorded or simulated samples are then explained, as is their graphical representation. The chapter closes with examples of authentic flow time measurements performed in industrial firms in Germany. Thus, readers will be able to carry out such evaluations in real shops by themselves.
Hans-Peter Wiendahl
Chapter 4. The Throughput Diagram — A General, Realistic Model of the Manufacturing Process
Abstract
This chapter develops the throughput diagram as the basis for describing the input and output events of a work center. It is shown that the four objectives of production control — inventory, lead time, utilization and lateness — can be graphically represented over time in this diagram. Furthermore, the basic relationship between mean lead time, mean inventory and mean utilization is derived from this diagram. Finally, the flow of orders through a whole shop is also represented by means of the throughput diagram.
Hans-Peter Wiendahl
Chapter 5. Analysis, Monitoring, and Diagnosis of the Manufacturing Flow
Abstract
Monitoring is continuous observation of the flow of orders through the manufacturing process by means of key figures and graphics. This chapter describes first how to organize and analyze a work shop, then explains the concept, and shows authentic results of such a continuous monitoring system. The outputs of such a system can be interpreted with a diagnostic system, of which the basic theory is given. Examples of color graphics taken from experimental and commercial systems illustrate possible outputs of monitoring systems. General rules on how to improve the manufacturing flow, and how existing production planning systems can be better used, are also given.
Hans-Peter Wiendahl
Chapter 6. Load-Oriented Order Release
Abstract
The term ‘Load-oriented order release’ stands for a method that controls flow times in a shop floor by controlling the actual input of work versus the planned output. The problem of managing not only the first work centers but also the downstream work centers will be solved using a mathematical approach which is easy to understand and to program, and which will be described in detail. The effect of the release method on the throughput of orders is then studied carefully by means of extensive computer simulations.
Hans-Peter Wiendahl
Chapter 7. Schedule-Oriented Capacity Planning and Control
Abstract
Load-oriented order release assumes that the capacities of the relevant work centers are given and balanced in advance, otherwise the algorithm will reject the orders which may overload bottleneck capacities. Using the throughput diagram, this chapter describes how the capacity adjustment can be achieved. It shows the necessary degree of flexibility of personnel operating the work centers.
Hans-Peter Wiendahl
Chapter 8. Implementation of Load-Oriented Manufacturing Control
Abstract
To implement load-oriented manufacturing control in a shop, some prerequisites have to be fulfilled, same as for any shop floor control system. After discussing these prerequisites, this chapter concentrates on the data flow diagrams and interfaces to MRP, thus enabling the readers to program such a system on their own. Some advice is given on how to introduce this concept, and what economic results can be expected.
Hans-Peter Wiendahl
Chapter 9. Comparison of Load-Oriented Manufacturing Control with Other Methods
Abstract
This chapter describes other well known methods of manufacturing control such as Kanban, Job-Progress Number, Queueing Models, and the OPT system, explains their fields of use as compared with Load-Oriented Manufacturing, and outlines their differences from the latter. It will be shown that all methods can be explained by means of the throughput diagram. The Electronic Leitstand, which is a kind of Gantt chart-based scheduling tool on a computer screen, is also briefly explained as a relatively new device for finite control of jobs once they have been released by shop floor control.
Hans-Peter Wiendahl
Chapter 10. Summary
Abstract
In view of the international competition among the industrialized countries, companies are becoming more and more interested in production planning and control (PPC). Short lead times, on-time schedule performance, and low inventories are the most important objectives, whereas the importance of utilization, on which much emphasis was placed in the past, has accordingly decreased.
Hans-Peter Wiendahl
Backmatter
Metadaten
Titel
Load-Oriented Manufacturing Control
verfasst von
Hans-Peter Wiendahl
Copyright-Jahr
1995
Verlag
Springer Berlin Heidelberg
Electronic ISBN
978-3-642-57743-7
Print ISBN
978-3-642-63343-0
DOI
https://doi.org/10.1007/978-3-642-57743-7