A workload control procedure for an FMC integrated in a job shop

Abstract

This paper describes an order release and loading technique, which considers the routing as well as the machine flexibility of a modern job shop production. The workload control approach involves three steps. In a first step 'lead orders', i.e. urgent production orders that are either processed on a known bottleneck or are of high value, are identified. Afterwards transfer batches of the lead part types are calculated using the aspired machine time as a control parameter. This parameter defines an adequate processing time of a machining center before it is set up for a new job. Finally, the bottom-line workload of the machining centers is determined by allocating and sequencing transfer batches. The procedure is tested by a simulation program that replicates the performance of the production facility of a machine manufacturer, consisting of a Flexible Manufacturing Cell that is embedded into a job shop production for heavy parts.

A Framework for the Selection or Design of Production Planning and Control Systems: A Case of Application

“…Evaluating WLC applicability in an Ecuadorian SMEs context: The WLC system is designed specifically for MTO environments, whereby different products are designed for different customers [17]. In fact, WLC has been presented as suitable for the large variety of products [53] required to meet increasing customer expectations in modern markets like the presented in Ecuadorian SMEs context.…”

Loading policies in cellular manufacturing systems with remainder cell

“…Balakrishnan and Cheng (2007) presented a review research that has been done to address cellular manufacturing of multi period planning horizons, with demand and resources uncertainties. The authors identify, among future areas for research the following: "Comparison of dynamic cells (in which physical cells are reconfigured periodically) versus robust cells (in which cells stay static and uncertainties are managed through strategies such as VCMS) is needed to identify the conditions under which one would be favoured over the other" Hoeck (2008) proposed an approach for order release and loading problem in a flexible manufacturing cell environment. The workload control approach involves three steps: lead orders are identified; transfer batches of the lead part types are calculated; workload of the machining centres is determined.…”

Ανάπτυξη Μηχανισμών Ανάδρασης Για Τον Προγραμματισμό Και Έλεγχο Της Παραγωγής Σε Συστήματα Κατά-Παραγγελία

“…Για την επίλυση των προβλημάτων ΧΠ σε συστήματα job shop έχει αναπτυχθεί ένα εύρος διαφορετικών τεχνικών και μεθοδολογιών που περιλαμβάνει μεταξύ των άλλων: α) αναλυτικές μεθόδους βελτιστοποίησης (Klemmt et al, 2009), β) κανόνες αποδέσμευσης (dispatching) (Matsuura and Kanezashi, 1996;El-Bouri and Shah, 2006;Singh et al, 2007), γ) αλγορίθμους «διακλάδωσης και ορίων» (branch and bound) (Zhang et al, 2009;Ng et al, 2010), δ) ευρετικές μεθόδους που βασίζονται στο φαινόμενο της «στένωσης» (bottleneck based heuristics) (Mönch et al, 2007;Yan et al, 2007;Zuo et al, 2007;Topaloglu and Kilincli, 2009) ε) τεχνικές τεχνητής νοημοσύνης (Ławrynowicz, 2007), καθώς και στ) γενετικούς αλγορίθμους (De Giovanni and Pezzella, 2010). Οι τεχνικές αυτές εφαρμόστηκαν τόσο σε μικρές παραγωγικές μονάδες αποτελούμενες από μια μηχανή (Baker, 1974;Glass et al, 2000), όσο και σε πολύπλοκα συστήματα παραγωγής απαρτιζόμενα από ευέλικτα κέντρα κατεργασιών (Hoeck, 2008;Yazdani et al, 2010).…”