Lead time management for production planning in job shops

Year 2020, Issue: 48, 179 - 195, 30.06.2020

Ahmet Hasköse

Abstract

Short and reliable lead times are
important to promote customer satisfaction and generate further orders,
particularly in the case of make-to-order and engineer-to-order manufacturing.
Moreover, accurate manufacturing lead times can greatly help production
planning and allocation of capacities. The design of a manufacturing system
refers to the configuration of elements such as the number of workstations,
storage, capacity and movement of work through the system. The design of a
manufacturing system can play a key role in manufacturing lead time. The
purpose of this paper is to investigate the effects of the number of
workstations, buffer sizes, processing capacities, number of entry workstations
and layout of a system on manufacturing lead time, and to demonstrate how such
an analysis can aid managerial decision making in production planning. Five
sets of experiments, with a total of 19 cases, were conducted. An approximate
model for arbitrary queueing networks is used to provide insights into the
general behaviour of manufacturing systems. These experimental results suggest
that the manufacturing lead time of a system is the most sensitive to layout of
the system, i.e., configuration of the system (feed-forward or feed-backward
topology) and the number of exit workstations.

Keywords

Job Shops, Queuing Network Modelling, Manufacturing Lead Time

Atölye tipi sistemlerin üretim planlamasında temin süresi yönetimi

Abstract

Kısa
ve güvenilir temin süreleri, özellikle siparişe-özel-üretim ve
siparişe-özel-tasarım şeklinde üretim yapan firmalarda müşteri memnuniyetini
artırmak ve siparişlerde süreklilik sağlamak için kritik önem taşımaktadır. Ayrıca
kesin ve güvenilir üretim temin süreleri, üretim planlamasına ve kapasite
tahsisine önemli ölçüde katkı sağlamaktadır. Bir üretim sisteminin tasarımı iş
istasyonu sayısı, bekleme alanlarının büyüklüğü, üretim kapasitesi ve işlerin
sistem içindeki rotaları gibi unsurların yapılandırılmasını kapsamaktadır. Üretim
sistemi tasarımı, temin süresinin belirlenmesinde önemli rol oynamaktadır. Bu
çalışmanın amacı, iş istasyonu sayısının, iş istasyonları arasındaki tampon
alanlarının büyüklüğünün, üretim kapasitesinin, giriş iş istasyonu sayısının ve
sistemin yerleşim planının üretim temin süresi üzerindeki etkilerini araştırmak
ve böyle bir analizin üretim planlamasında yönetimsel karar almaya nasıl yardım
edebileceğini göstermektir. Çalışmada, 19 vakanın bulunduğu beş ayrı grupta
denemeler gerçekleştirilmiştir.  Üretim
sistemlerinin performanslarının belirlenmesinde yapılandırılmamış kuyruk ağları
için geliştirilen yaklaşık bir model kullanılmıştır. Deneme sonuçları üretim
temin süresinin, sistemin yerleşim planından (sistemin yapılandırmasının ileri
veya geri beslemeli oluşu ve çıkış iş istasyonlarının sayısından) önemli ölçüde
etkilendiğini göstermektedir.

Keywords

Atölye Tipi Üretim Sistemleri, Kuyruk Ağı Modeli, Üretim Temin Süresi

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