Prediction of Distortions in Hot Forged Martensitic Stainless Steel Turbine Blades by Numerical Simulation

open4noopenSimonetto, Enrico; Bruschi, Stefania; Ghiotti, Andrea*; Savio, EnricoSimonetto, Enrico; Bruschi, Stefania; Ghiotti, Andrea; Savio, Enric

Integrated training in using different Coordinate Measuring Systems to support Digital Manufacturing

Highly qualified labour force is a key resource for growth. In modern manufacturing, the competent use of advanced measuring equipment for inspection and digitization of parts is an essential competence that is needed for both advanced product/process engineering and quality control. Coordinate Metrology (including 3D digital measuring technologies) is by far the most important tool for these specialized activities. As widely reported, the individuals operating the measuring systems - with their decisions - are frequently one of the most relevant error sources in Coordinate Metrology operations, especially when dealing with new measuring technologies supporting Digital Manufacturing (e.g. Computed Tomography, Fringe-projection, Reverse Engineering). The paper reports the intermediate results of an initiative aiming at innovating training in Coordinate Metrology, focused on supporting the needs of SMEs in the supply chain of the automotive industry. The main target group are industry employees operating in SMEs that are newcomers on 3D measuring technologies. An integrated concept for training in Coordinate Metrology has been developed using a blended learning approach, based on a 10-steps structure and incorporating the learning outcomes required to operate different measuring systems in a consistent way

Integrated training in using different Coordinate Measuring Systems to support Digital Manufacturing

International audienc

Economic benefits of metrology in manufacturing

In streamlined manufacturing systems, the added value of inspection activities is often questioned, and metrology in particular is sometimes considered only as an avoidable expense. Documented quantification of economic benefits of metrology is generally not available. This work presents concrete examples from industrial production, in which the added value of metrology in manufacturing is discussed and quantified. Case studies include: general manufacturing, forging, machining, and related metrology. The focus of the paper is on the improved effectiveness of metrology when used at product and process design stages, as well as on the improved accuracy and efficiency of manufacturing through better measuring equipment and process chains with integrated metrology for process control

Masked stereolithography of wollastonite-diopside glass-ceramics from novel silicone-based liquid feedstock

Silicate bioceramics, including systems based on the simultaneous presence of wollastonite (CaSiO3) and diopside (CaMgSi2O6), are of great interest in bone tissue engineering applications, especially in form of variously shaped three-dimensional scaffolds, as determined by application of several additive manufacturing technologies. In this framework, silicone resins, properly modified with CaO- and MgO-based fillers and blended with photocurable acrylates, are attractive both as precursors and as feedstock for additive manufacturing technologies, including stereolithography. The use of powder fillers, however, may lead to issues with homogeneity or with printing resolution (owing to light scattering). The present paper aims at presenting the first results from a new concept of incorporation of CaO and MgO, relying on salts dispersed in emulsion within a photocurable silicone/acrylate blend. Direct firing at 1100 °C of printed scaffolds successfully produced wollastonite-diopside glass-ceramic scaffolds, with a very fine crystal distribution. The strength-to-density was tuned by operating either on the topology of scaffolds or on the firing atmosphere (passing from air to N2)

Cost Effective 3D Printed Heatsink for Fast Prototyping of WBG Power Converters

Power density has become a critical figure of merit in power conversion systems, especially in automotive and aerospace applications. Nowadays, wide band gap (WBG) devices are revolutionizing power conversion by enabling unprecedented levels of efficiency and power density. High power density is possible only with advanced integrated cooling solutions based on custom-made heatsinks that must be properly tailored to match the packages of the WBG devices selected for the application. However, the design and prototyping of custom-made heatsinks, typically crafted from aluminium, require significant cost and time during the converter iterative prototyping phases. To address these challenges, this digest proposes a liquid-cooled heatsink made of a combination of 3D-printed plastic material and aluminium. The proposed heatsink, tailored for rapid prototyping, leads to a drastic reduction in costs and development time compared to traditional aluminium heatsinks. Moreover, the incorporation of plastic material delivers additional benefits, including reduced weight and seamless integration with electronic components, owing to its inherent insulating properties

Geometrical Product Specification and Verification as toolbox to meet up-to-date technical requirements

The ISO standards for the Geometrical Product Specification and Verification (GPS) define an internationally uniform description language, that allows expressing unambiguously and completely all requirements for the geometry of a product with the corresponding requirements for the inspection process in technical drawings, taking into account current possibilities of measurement and testing technology. The practice shows that the university curricula of the mechanical engineering faculties often include only limited classes on the GPS, mostly as part of curriculum of subjects like Metrology or Fundamentals of Machine Design. This does not allow students to gain enough knowledge on the subject. Currently there is no coherent EU-wide provision for vocational training (VET) in this area. Consortium, members of which are the authors of this paper, is preparing a proposal of an EU project aiming to develop appropriate course

Validation of the sensitivity analysis method of coordinate measurement uncertainty evaluation

The paper presents the results of the tests carried out to validate a new method for evaluating the uncertainty of coordinate measurements categorised as the Sensitivity Analysis (SA). This method concerns measuring dimensions and geometrical deviations. Measurement uncertainty is evaluated on the basis of information given in the Maximum Permissible Error (MPE) formula for a Coordinate Measuring Machine (CMM). Measurement models express the measured characteristics as a function of differences of coordinates of a small number of appropriately selected points of the workpiece. If reverification test results for the CMM used are available, then the estimated uncertainty takes into account the actual accuracy of the CMM. General formulae are given to calculate the uncertainty of measurement of a circle diameter and coaxiality. The relevant experiment is based on ISO 15530-3 recommendations. A calibrated cylindrical square was used for validation. 17 circles’ diameters and 84 different combinations of datum length and distance of the toleranced element from the datum for measuring coaxiality were adopted as validated characteristics. The validation results are presented in tables and graphs and the chi-square test for equality of variances was used to confirm that the method is correct. The validation results are positive

Il laboratorio archeologico come punto di incontro interdisciplinare: l’esperienza della facoltà di conservazione dei beni culturali

The opening of archaeological laboratory in the “Dipartimento di Storie e Metodi per la Conservazione dei Beni Culturali“ means an important stage in the way of Phoenician and Punic studies. The integration of excavation activities with diagnostic and conservative interventions on archaological finds is well connected with an interdisciplinary target. This proceeding agrees with the direction of researches carried out in the Tharros tofet since 1970 and is of primary importance regarding the didactic offer