APPLICATION OF FUZZY STATISTICAL PROCESS CONTROL FOR A MANUFACTURING OF GG25 GRAY CAST IRON MATERIAL

Year 2018, Volume: 7 Issue: 1, 427 - 437, 31.01.2018

Murat Çolak Metin Uçurum Mehmet Çınar Ümit Atıcı

https://doi.org/10.28948/ngumuh.387316

Cited By: 1

Abstract

   The group of ferrous materials with more than 2%
carbon in their chemical composition is commonly referred to as cast iron
materials. Carbon Equivalent (CE) is an empirical value in weight percent,
relating the combined effects of different alloying elements used in the making
of cast iron to an equivalent amount of carbon. Statistical process control
(SPC) can be applied in plants to obtain good quality and high standard
products which have become very popular in many industries. Fuzzy process
capability analysis by using X-R control charts gives more realistic results,
developed with fuzzy theory. Fuzzy control charts are more sensitive than SPC.
This study contains construction of a system design to observe whether the
conditions of an alloy production line are within the specification and control
limits. To determine the average percentage of CE
values, the fuzzy X-bar and R charts were
applied to GG25 gray cast iron samples for 20 days’ production. In order to
control the process parameters and improve quality of the cast products, the
comparison of the statistical and experimental
results show that the fuzzy SPC methods can be simply applied on a
foundry.

Keywords

GG25 gray cast iron, carbon equivalent, fuzzy statistical process control

GG25 GRİ DÖKME DEMİR MALZEMESİNİN ÜRETİMİNDE BULANIK İSTATİSTİKSEL PROSES KONTROLÜNÜN UYGULANMASI

Abstract

   Kimyasal
bileşimlerinde %2'den fazla karbon içeren demirli malzemeler grubuna yaygın
olarak dökme demir malzemeleri denir. Karbon Eşdeğeri (CE), dökme demir
üretiminde kullanılan farklı alaşım elementlerinin kombine etkilerini eşdeğer
miktarda karbon ile ilişkilendiren, ağırlık yüzdesi olarak ampirik bir
değerdir. İstatistiksel proses kontrol (SPC), çok popüler hale gelen kaliteli
ve yüksek standartlı ürünler elde etmek için fabrikalarda yaygın olarak uygulanmaktadır.
Bulanık proses kontrol analizi, X-R kontrol çizelgelerini kullanarak, bulanık
teori ile geliştirilmiş daha gerçekçi sonuçlar veren bir tekniktir. Bu çalışma,
bir gri dökme demir üretim hattı koşullarının, şartname ve kontrol sınırları dâhilinde
olup olmadığını bulanık istatistiksel proses kontrol tekniği ile gözlemlemek
için gerçekleştirilmiştir. Bulanık X-R grafikleri, 20 günlük üretim için GG25
gri dökme demir numunelerine uygulanmıştır. Sonuçlar, bulanık istatistiksel
proses kontrol (SPC) yöntemlerinin bir dökümhaneye basitçe uygulanabileceğini
göstermektedir

Keywords

GG25 gri dökme demir, karbon eşitliği, bulanık istatistik kontrol

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