Failure Mode and Effects Analysis (FMEA) is a method of analysing potential failures of a product or process, in order to plan the necessary measures to prevent their occurrence. Being a critical analysis method, FMEA has extremely precise objectives: determining the weak points of a technical system; searching for the initiating causes of component dysfunction; determining the needs of technology upgrading and modernization of production; increasing the level of communication between work compartments, people, hierarchical levels; analysis of the consequences on the environment, the safety of operation, the value of the product; providing corrective actions to remove the causes of defects; providing a plan to improve product quality and maintenance. The FMEA must be used from the design phase before the product is made.This paper describes a study about the improving the quality process for an axis for packaging using FMEA method. The potential causes of the defects have been studied and improvement measures have been proposed. Among these we mention: implementation and monitoring of the preventive maintenance program; providing specific compliance; self-control, flow or sample control; periodic training and retraining; upgrading existing equipment, acquisition of more advanced software.
SPC (Statistical Process Control) is one of the Lean Manufacturing techniques, but especially Six Sigma, being a method of improving the quality of the manufacturing process, which allows the identification of errors before their production, with the help of which a process can be supervised and when needed, it is possible to carry out an intervention of regulation, respectively of correction of the process, before being nonconformities. The paper presents a study regarding the use of SPC at a company in the automotive field in order to improve the quality of the manufacturing process for a knuckle. Thus, a number of 25 samples were taken, each sample containing a number of 5 pieces. After sampling, a series of techniques and statistical data were used, respectively diagrams and control sheets, which allowed the determination of the process capability by using MiniTab software.
Ti-based alloys are an important class of materials suitable especially for medical applications, but they are also used in the industrial sector. Due to their low tribological properties it is necessary to find optimal technologies and alloying elements in order to develop new alloys with improved properties. In this paper, a study on the influence of sintering treatments on the final properties of a titanium alloy is presented. The alloy of interest was obtained using the powders in following weight ratio: 80% wt Ti, 8% wt Mn, 3% wt Sn, 6% wt Aluminix123, 2% wt Zr and 1% wt graphite. Two sintering methods were used, namely two-step sintering (TSS) and multiple-step sintering (MSS), as alternatives to conventional sintering which uses a single sintering dwell time. Evolution of sample morphology, composition and crystalline structure with sintering method was evidenced. The lower values for the friction coefficient and for the wear rate was attained in the case of the sample obtained by TSS.
This paper describes a study concerning the inner turning of a piece of duralumin, using 6 values of the feed. The shapes and micro-geometry of the resulting chips have been observed experimentally and these are explained by the large deformations in the cutting area. The processed surfaces, both by enlarging them to a microscope and by measuring the roughness have been experimentally studied. Also, the sections of chips are analysed, giving the theoretical and real dimension values, also interpreted on the basis of the deformations in the cutting area. Also, values of roughness parameters are presented.
Powder metallurgy is a complex technology that allows obtaining various alloys with special properties which successfully replace alloys achieved by classical technologies. The ability to easily modify classic chemical compositions makes this technology an instrument in the hands of researchers that enables them to always improve the properties of sintered alloys. In addition, the technology itself is very permissive, and new technical solutions can always be found in the technological process of pieces manufacturing. Among the materials very used in the technique, which is very well suited to this technology is titanium. Titanium in combination with other chemical elements greatly improves its operating behavior of obtained material. Therefore, this study proposes a combination of titanium with tin and graphite, recommended for improving wear resistance. The other elements used in the mixture, Al, Zr, Mn help to improve the mechanical properties. The paper intends to present a study on the wear resistance of this Ti alloy, sintered in different ways. SEM and spectrometry analyzes for sintered parts are also presented.
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