การจัดการสินค้าคงคลังของวัตถุดิบหลักในการผลิตสายพานลำเลียงของ บริษัท สยาม ไวร์ เน็ตติ้ง จำกัด

Abstract

The objective of this independent study was to examine the Inventory Management of main raw materials in the production of conveyor belts at Siam Wire Netting Company Limited. The goal was to understand how to effectively manage inventory, with the information applied to the management of main raw materials in the production of conveyor belts by employing ABC Analysis. There were 46 items of main raw materials for the production of conveyor belts, categorized into three groups: A, B, and C, comprising specific percentages of the total purchase value of main raw materials, which were 71%, 35%, and 9%. In this research, the focus was solely on the main raw material group A for demand forecasting. Various forecasting methods were utilized in this research, including Moving Average, Exponential Smoothing, Holt’s Method, Holt-Winter, Croston's Method, Syntetos and Boylan. The accuracy of the forecasts was then assessed using the minimum Mean Absolute Deviation (MAD). The obtained predictions were further analyzed to determine the coefficient of variance, aiding in the selection of an appropriate inventory management method. This involved determining the Economic Order Quantity (EOQ) and Silver Meal method, as well as establishing the Reorder Point (ROP) and safety stock (SS). The results of this independent study revealed that the costs associated with raw material inventory management could be reduced by 249,568.97 Baht or 1.77% per year by implementing raw material inventory management techniques.