PULLEY PRODUCT QUALITY IMPROVEMENT IN PT PINDAD (PERSERO) USING SIX SIGMA METHODOLOGY

• Main Author: RIVALDI PUTRA, ARYADILLA
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/43395
• Institution: Institut Teknologi Bandung

In 2018, PT Pindad incurred considerable costs due to reworked and rejected products. PT Pindad strives to reduce this cost, one of them is by improving the quality of products produced by the Casting I Department. Pulley is one of the products with the highest demand produced by the Casting I Department. However, based on the data from October 2018 to February 2019, 214 out of 27,734 units of Pulley products are defective. The defective product proportion is about 0.77%. This proportion is quite high so that improvements are needed to reduce the number of defective products in the future. The methodology used in this study is the Six Sigma methodology which consists of five stages, namely Define - Measure - Analyze - Improve - Control or DMAIC. The Define stage aims to determine the research object as well as the problems to be discussed in the study, which is the quality improvement of Pulley products in the Casting I Department. The Measure stage aims to measure the current condition by measuring the stability and capability of the production process. The result of the process stability and capability measurement indicates that in general, the production process of Pulley product runs stably the calculated sigma level of 3.26. This value does not meet the company's target, that is the sigma level of 3.46. The Analyze phase aims to determine the root cause of the defective Pulley products and determine the priority of the problems to be solved by using Failure Mode and Effect Analysis (FMEA). At this stage, pareto chart is used to determine the type of defect that will be further investigated, those are Shrinkage, Slag Inclusion, and Sand Inclusion. The results of the Define, Measure, and Analyze stages are discussed further in the Improve and Control stages. The Improve stage aims to arrange, choose, and design the solutions. At this stage, six out of eight solutions were accepted. The Control Stage aims to ensure that the chosen solution is applied properly in accordance with the plans that have been prepared in the Improve stage. This is done by establishing a timeline for the implementation and improving the Standard Operating Procedure (SOP) document.