تخمين قطعات يدكي مورد نياز در معادن به روش تحليل قابليت اطمينان، مطالعه موردي معدن مس سونگون

Mining Spare Parts Provision by Reliability Analysis, Case Study: Sungun Copper Mine

مديريت قطعات يدكي و تداركات، وجهي از مديريت پشتيباني محصولات و مؤثر در هزينه چرخه عمر محصول است. دسترسي به قطعات يدكي به هنگام تقاضا، زمان افت سيستم/ماشين را كاهش داده و كارايي آن را افزايش و در نتيجه سود حاصله از كل پروژه را افزايش خواهد داد. در صورت ذخيره تعداد بهينه قطعات يدكي در انبار، هزينه‌هاي چرخه عمر محصول به عنوان تابع هدف، كمينه خواهد شد. تعداد بهينه قطعات‌يدكي را نيز مي‌توان با وارد نمودن عوامل مختلف مانند تعداد وقوع خرابي، تعداد تجهيزات موجود، حساسيت قطعه، هزينه‌هاي خريد قطعه، فاصله بين توليدكننده تا مصرف‌كننده و زمان‌هاي تأخير بين تصميم تا اجرا تعيين كرد. تخمين قطعات يدكي مورد نياز بر اساس ويژگي‌هاي فني و كاركردي سيستم و اجزاء يكي از مؤثرترين راه‌ها براي بهينه‌سازي توقفات ناخواسته است. از اين‌رو در اين مقاله رويكرد پيش‌بيني قطعات يدكي مورد نياز بر اساس قابليت اطمينان پيشنهاد شده است. در اين رويكرد نخست قابليت اطمينان جزء، بر اساس داده‌هاي خرابي تعيين شده و سپس تعداد قطعات يدكي موردنياز، ميزان سفارش بهينه و زمان ارسال سفارش بر اساس مصرف ساليانه محاسبه خواهد شد. همچنين به‌منظور كاربرد اجرايي رويكرد پيشنهادي مطالعه موردي از معدن مس سونگون بررسي شده است.

Maintenance and spare parts support are two basic and critical issues of support to product, because often due to lack of technology and other compelling factors (like economy, environmental situations, etc), in the design phase it is impossible to design a product that will fulfill its function. Therefore, the need for support haw become vital to enhance system effectiveness and prevent unexpected failure. This paper was focused on second issues of support. Thus, for studying of the required spare parts, we analyzed the failure time data for a period of 11 years, which has been obtained from Sungun Copper mine in Iran. The expected number of the required spare tires in one year (three working shifts per day) when , and hours for lower, optimum and upper value are considered to be the real mean time to failure of the tire with a 95 percent confidence of availability are equal to 3.2, 2 and 1.2 respectively. Then, the economic order quantity with respect to annual demand rate is calculated. Introduction Product support falls into two broad categories, namely support to the customer and support to the product. The research presented in this paper is focused on support to the product, which is greatly influenced by the product reliability characteristics. Spare parts organize one of the product support issues that can be divided into two types, namely repairable and non-repairable. In the present research we deal with non-repairable parts. Spare parts provisioning is a complex problem and requires an accurate analysis of all factors that may affect the required number of spare parts. Different reliability based statistical approaches have been developed for spare parts provision. The reliability-based spare parts provision is the most common one. Methodology and Approaches The methodology is based on three main tasks, 1) Definition of boundaries, assumptions, and data collection.2) Identification of analysis approach and estimation of component reliability and failure rate characteristics. 3) Required spare parts calculation and inventory management requirements Results and Conclusions In this paper, a methodology is proposed to consider reliability in the required spare parts tires estimation. The result of analysis for optimum estimation of PLP parameters presented that for a year dump truck need 2 new tires. For inventory management whenever the inventory position reaches 1 units/dump truck, we should order 2 units/dump truck.