Perencanaan Produksi pada Produk Hollow dengan Ukuran 15 mm X 35 mm X 0.30 mm

PT Mulcindo is a manufacturing and service industry company works in the production of processed iron. This company produces corrugated steel sheet, iron canal, ceiling hanging guard rail, and partition frame. However, the demand for this company was fluctuating. Due to this fluctuation, PT Mulcindo Steel Industry has some problems such as product shortages or on the other hand product overload (over stock). This company is trying to find better production activities planning to fulfill market demand by using the right production planning. The results of the aggregate planning method in planning hollow production with a size of 15 mm x 35 mm x 0.30 mm in PT Mulcindo Steel Industry using the heuristic method, labor control with total aggregate planning costs of Rp. 674,937,732.2 / year, controlling sub-contracts with total aggregate planning costs of Rp. 822.136,585,3 / year, mix with overtime with total aggregate planning costs of Rp. 208,791,410.5 / year, Use of spreadsheets using regular production with trial and error techniques with total aggregate planning costs of Rp. 408,543,000 / year, the aggregate planning method in production planning obtained the minimum cost of Rp. 208,791,410.5 / year that is by using the heuristic method with mixed method completion techniques with over time. Keywords : Forecasting, Time Series, Aggregate Planning.

ELECTRODEPOSITION OF CuZn ALLOYS FROM THE NON-CYANIDE ALKALINE BATHS

Effect of copper sulfate on CuZn alloys electroplating from non-cyanide baths are investigated by different electrochemical methods. Cyclic voltammetry and current transient measurements are used to characterize the CuZn alloys electroplating system in order to analyze the nucleation and growth mechanism. The reduction of Cu and CuZn alloy on sheet iron substrates shows an instantaneous nucleation process. However, the reduction of Zn on sheet iron substrates shows a progressive nucleation process. The structure and surface morphology of CuZn alloys are analyzed by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The morphology of CuZn alloys obtained with 50 g L-1 copper sulfate presents a smooth and compact deposit and the size of crystal particle is uniform.