ANALISIS PENGENDALIAN RAW MATERIAL BILLET ALUMINIUM MENGGUNAKAN FORECASTING TIME SERIES DAN EOQ (Studi kasus: PT. XYZ)

Abstract

Abstrak

Persediaan merupakan hal yang sangat penting bagi suatu perusahaan produksi. Persediaan atau inventory merupakan suatu modal awal perusahaan di mana persediaan ini dapat berupa bahan baku (raw material), barang atau produk yang sedang dalam proses produksi (work in process), dan barang jadi yang merupakan hasil produksi yang siap untuk dipasarkan (finished product). persediaan sendiri jika tidak dilakukan secara baik dan sesuai, maka dapat terjadi kekurangan atau kelebihan produk. Hal ini akan berakibat pada perusahaan terutama dalam pengeluaran biaya. Mengatasi hal tersebut dapat menggunakan beberapa metode khususnya metode forecasting dan EOQ. Metode forecasting sendiri digunakan untuk melihat berapa jumlah persediaan optimal pada periode selanjutnya. Berdasar hasil ramalan menggunakan 5 metode, didapatkan hasil ramalan terbaik menggunakan metode holts wimters. Metode holts winter, didapatkan nilai MAPE sebesar 6,4%. Metode selanjutnya yang digunakan ialah menghitung jumlah safety stock, dan reorder point. Berdasar hasil perhitungan, jumlah safety stock ialah sebesar 2,024 billet, nilai minimal sebesar 7.684 billet, dan nilai maksimal sebesar 13.343 billet. Reorder point dilakukan jika billet telah mencapai jumlah 7.684 billet, dengan jumlah pemesanan sebanyak 5.659 billet sebanyak 12x pemesanan.

Kata kunci: Agregat; EOQ; Forecasting; Min-Max; Persediaan; Reorder point

Abstract

[Analysis Of Aluminum Billet Raw Material Control Using Time Series Forecasting And Eoq] Inventory is very important for a production company. Inventory or inventory is a company's initial capital where this inventory can be in the form of raw materials (raw materials), goods or products that are in the production process (work in process), and finished goods which are the results of production that are ready to be marketed (finished product). inventory itself if not done properly and accordingly, there can be a shortage or excess products. This will have an impact on the company, especially in spending costs. Overcoming this can use several methods, especially forecasting and EOQ methods. The forecasting method itself is used to see what is the optimal amount of inventory in the next period. Based on the results of forecasting using 5 methods, the best forecast results were obtained using the Holts Wimters method. Holts winter method, obtained a MAPE value of 6.4%. The next method used is to calculate the amount of safety stock, and reorder point. Based on the calculation results, the amount of safety stock is 2.024 billets, the minimum value is 7.684 billets, and the maximum value is 13.343 billets. Reorder point is done if the billet has reached the amount of 7.684 billets, with an order quantity of 5.659 billets for 12 orders.

Keywords: Aggregate; EOQ; Forecasting; Inventory; Min-Max; Reorder point