ANALISIS PENERAPAN KONSEP LEAN MANUFACTURING PADA PROSES PRODUKSI STAINLESS STEEL COIL UNTUK MEREDUKSI PEMBOROSAN (WASTE) DI PT. XYZ

PT. XYZ merupakan perusahaan manufaktur yang bergerak dalam bidang produksi Stainless Steel Coil. PT. XYZ berharap dapat mengurangi pemborosan dalam proses produksinya, sehingga perusahaan dapat mendapatkan laba yang lebih besar dan mampu bersaing di industri saat ini. Tujuan dari penelitian yang dilakukan adalah untuk mengidentifikasi, mereduksi dan memberikan usulan perbaikan terhadap pemborosan (waste) pada proses produksi Stainless Steel Coil. Metode yang digunakan adalah konseplean manufacturing dengan tools value stream mapping dan bantuan metode Failure Mode and Effect Analysis (FMEA). Berdasarkan hasil penelitian pada value stream mapping didapatkan reduksi waktu dari 461 menit atau 27.660 detik menjadi 416 menit atau 24.960 detik. Berdasarkan Failure Mode and Effect Analysis (FMEA) diketahui akar penyebab masalah pada pemborosan (waste) tertinggi adalah Set up hot bucket yang kurang sesuai dan terjadi unplanned downtime atau kurang perawatan mesin. Rekomendasi perbaikan yang dapat diusulkan yaitu pembuatan jadwal pengurasan atau pembersihan hot bucket serta pengetatan terhadap set-up waktu hot bucket dan memperketat jadwal perawatan atau maintainance pada mesin Rolling Mill.

Effect of Flowrate and Circulation Time on Fractionation of Refined Bleached and Deodorised Palm Oil using Progressive Freeze Concentration Method

This research concerns on the possibility of separating refined, bleached and deodorised palm oil (RBDPO) into olein and stearin using another alternative through Progressive Freeze Concentration (PFC) to replace the conventional process of dry fractionation. The process was carried out in stainless steel coil crystalliser and the quality of olein and stearin and the performance of crystalliser to purify the olein were analysed. The quality of oil was evaluated through iodine value (IV) and Slip Melting Point (SMP), while for the performance of PFC, effective partition constant, K, and yield of olein were used to determine the system efficiency. The purified olein were obtained for IV and SMP at higher flowrate (2800 mL/min) and longer period of time (60 min) are 55.87wijs and 23.04°C, 55.89wijs and 23.08°C, respectively. Meanwhile, the best K and yield of olein were obtained at higher flowrate and time, giving values of 0.2369, 67.99% and 0.238 and 67.93%, respectively.

Micro Hole Piercing for Ultra Fine Grained Steel

Ultra fine grained steels have been developed by many researchers. However, studies on the effects of different grain size on processes and product functions have been limited because the size of the bulk material has been small for these products. The authors have developed a production process for thin ultra fine grained stainless steel coil, and the effects have been clarified. This paper first reports the effects onmicro hole piercing by comparing materials with different grain sizes. Secondly, orifices are produced from these materials, and the liquid flow volume is measured as the functional effect of different grain sizes.