Diseño de un sistema estadístico de calidad para la producción de vidrio termoformado en la Microempresa Rioglass.

Abstract

This research work proposes a statistical quality control system for the production of thermoformed glass, which is presented through a manual that shows: the organization of the company, strategic foundations, corporate values, internal regulations, FODA, administrative structure and process analysis. The study was carried out in two moments (before and after) of the execution of a pilot plan of the proposed system. For the historical data a Pareto diagram was elaborated to identify the main causes of the defects in the process of obtaining thermoformed glass and it was found that the main anomaly is the rupture. Subjecting ourselves to the central limit theorem, production was analyzed multivariate using the T2 Hotelling control chart with four variables (quantity, thickness, area and number of defectives), in which it found 7 points out of control, which were due to the graphs of contribution proportions of the 4 variables presented points outside the limits. The execution of the pilot plan of the proposal was carried out with a follow-up of 6 months, during which seven variables were recorded (quantity, thickness, area, time of process, time spent in the furnace, temperature and number of defectives) in the new data collection forms and using the same methodology mentioned above, found 1 point out of control due to the thickness and quantity of defectives, and in the analysis with the seven variables,2 points were found that exceed the control limits. The execution of the pilot plan of the proposed quality statistical system reduced the instability of the process from 12% to 2% and identified that the breaking of glass occurs in baking. The statistical tools (flowchart of the process, brainstorming, Pareto diagram of defects, Ishikawa diagram of most common causes of defective production and information collection forms, histograms and univariate and multivariate control charts) used in the Comparison of results were performed by contrasting Wilcoxon hypotheses. The owner manager of the Rioglass microenterprise is suggested to maintain the proposed control system, in order to obtain a continuous improvement of production.