بررسي كاربرد فرايند كنترل كيفيت آماري در شركت صنايع چوب كيش

Application of statistical quality control process in Kishwood industrial company

ﭼﮑﯿﺪه در اﯾﻦ ﭘﮋوﻫﺶ، ﮐﺎرﺑﺮد ﻓﺮآﯾﻨﺪ ﮐﻨﺘﺮل ﮐﯿﻔﯿﺖ آﻣﺎري در ﺷﺮﮐﺖ ﺻﻨﺎﯾﻊ ﭼﻮب ﮐﯿﺶ ﻣﻮرد ﺑﺮرﺳﯽ ﻗﺮار ﮔﺮﻓﺖ. ﻓﺮآﯾﻨﺪ ﮐﻨﺘﺮل ﮐﯿﻔﯿﺖ آﻣﺎري ﺷﺎﻣﻞ اﻧﻮاع ﻧﻤﻮدارﻫﺎي ﮐﻨﺘﺮل و ﻃﺮحﻫﺎي ﻧﻤﻮﻧﻪﮔﯿﺮي ﺑﻪﻣﻨﻈﻮر ﭘﺬﯾﺮش ﻣﯽﺑﺎﺷﺪ. در اﯾﻦ ﻣﻄﺎﻟﻌﻪ ﺑﺎ اﺳﺘﻔﺎده از ﺟﺪاول اﺳﺘﺎﻧﺪارد ﺑﺎزرﺳﯽ، ﻣﺸﺨﺼﻪﻫﺎي ﮐﻤﯽ و ﮐﯿﻔﯽ ﻣﻮاد اوﻟﯿﻪ و ﻣﺤﺼﻮﻻت در ﺟﺮﯾﺎن ﺳﺎﺧﺖ، ﺑﺮرﺳﯽ و ﻫﻤﭽﻨﯿﻦ ﻧﻤﻮدارﻫﺎي ﮐﻨﺘﺮل ، P ،R و U ﺑﺮاي ﻓﺮآﯾﻨﺪﻫﺎي ﺷﯿﺎرزﻧﯽ، ﺳﻮراخﮐﺎري، روﮐﺶﮐﺎري و ﻧﻮارﮐﺎري ﻃﺮاﺣﯽ ﺷﺪﻧﺪ. در ﻗﺴﻤﺖ ﻣﻮاد اوﻟﯿﻪ و ﻣﺤﺼﻮﻻت در ﺟﺮﯾﺎن ﺳﺎﺧﺖ، ﺑﻬﺮﻫﺎي ﻣﺮﺑﻮط ﺑﻪ امدياف 16 ﻣﯿﻠﯽﻣﺘﺮ، روﮐﺶ اچﭘﯽال، ﻧﻮار ﻟﺒﻪ ايﺑﯽاس ﺧﺮﯾﺪاري ﺷﺪه و ﻓﺎﺻﻠﻪ ﺳﻮراخ دوﺑﻞ از ﻟﺒﻪ ﻗﻄﻌﻪ از ﻧﻈﺮ ﻣﺸﺨﺼﻪ ﮐﻤﯽ ﺑﺎ اﺳﺘﻔﺎده از ﺟﺪاول اﺳﺘﺎﻧﺪارد ﻧﻈﺎﻣﯽ 414 ﺑﺮرﺳﯽ ﺷﺪﻧﺪ. ﺑﻬﺮ ﺗﺨﺘﻪ ﺧﺮدهﭼﻮب روﮐﺶدار ﺧﺮﯾﺪاري ﺷﺪه و ﺻﺤﺖ ﻧﻮار ﻟﺒﻪ در ﻗﻄﻌﺎت ﮐﻒ ﮐﺎﺑﯿﻨﺖ از ﻧﻈﺮ ﻣﺸﺨﺼﻪ ﮐﯿﻔﯽ ﺑﺎ اﺳﺘﻔﺎده از ﺟﺪاول اﺳﺘﺎﻧﺪارد ﻧﻈﺎﻣﯽ 105E ﻣﻮرد ﺑﺎزرﺳﯽ ﻗﺮار ﮔﺮﻓﺖ. ﻫﻤﻪ ﻣﻮارد ﺑﺎ ﺳﻄﺢ ﮐﯿﻔﯿﺖ ﻗﺎﺑﻞ ﻗﺒﻮل ﺷﺮﮐﺖ ﻣﻄﺎﺑﻘﺖ داﺷﺘﻨﺪ. ﻗﺮار ﮔﺮﻓﺘﻦ ﻧﻘﺎط ﺑﯿﻦ ﺣﺪود ﮐﻨﺘﺮل در ﻧﻤﻮدارﻫﺎي ﮐﻨﺘﺮل ﺑﯿﺎﻧﮕﺮ آن اﺳﺖ ﮐﻪ ﻫﺮ ﯾﮏ از ﻓﺮآﯾﻨﺪﻫﺎ در ﻣﻘﻄﻊ زﻣﺎﻧﯽ اﻧﺠﺎم ﻣﻄﺎﻟﻌﻪ ﺗﺤﺖ ﮐﻨﺘﺮل ﺑﻮده و ﻣﯽﺗﻮان از آﻧﻬﺎ ﺑﻪﻣﻨﻈﻮر ﮐﻨﺘﺮل آﯾﻨﺪه ﻓﺮآﯾﻨﺪ اﺳﺘﻔﺎده ﮐﺮد. ﺑﺎ ﻣﺤﺎﺳﺒﻪ ﺷﺎﺧﺺ ﻗﺎﺑﻠﯿﺖ ﻓﺮآﯾﻨﺪ ﻣﺸﺨﺺ ﺷﺪ ﮐﻪ ﻓﺮآﯾﻨﺪﻫﺎي ﺷﯿﺎرزﻧﯽ و ﺳﻮراخﮐﺎري ﻗﺎﺑﻠﯿﺖ ﺑﺴﯿﺎر ﺑﺎﻻﯾﯽ داﺷﺘﻪ و در ﻧﺘﯿﺠﻪ درﺻﺪ ﺿﺎﯾﻌﺎت در اﯾﻦ دو ﻓﺮآﯾﻨﺪ ﺑﺴﯿﺎر ﭘﺎﯾﯿﻦ اﺳﺖ.

In this research, application of statistical quality control process in Kishwood industrial company has been investigated. Statistical quality control process includes control charts and acceptance samplings. In this study, qualitative and quantitave characteristics of raw material and work in progress was investigated using standard tables and control charts (̅X, R, P,U) were designed for grooving, drilling, laminating and edge banding processes. In the raw material and work in progress, medium density fiberboard (16mm) lots, HPL veneer, purchased ABS stripe and the distance of the double hole from the edge of the piece in terms of quantative characteristic were investigated by MIL-STD-414 tables. In addition, purchased veneered particle board lot and the accuracy of the stripe in cabinet bottom parts in terms of qualitative characteristic were investigated by MIL-STD-105E tables. All the results were compatible with the acceptable standards of the company. Since lots data were located in the control limits, we can conclude that the whole process had been under control during the research time and can be used to control the future of the process. By calculating the process capability index (CP), it was found that grooving and drilling process have a very high capability, so the percentage of waste in these two processes is very low.