0000000000239694
AUTHOR
M. Piacentini
Numerical and Experimental Investigation on Hot Impression Die Forging: Flash Design Optimisation
In forging processes, several parameters have a great influence on the quality of the final product: complexity of the product geometry, lubricating conditions, temperature, preform shape. The main objective of a forging design process is to ensure an adequate material flow aimed to obtain a defect free component minimizing material losses, forging loads and tool wear. In this paper, the problem of optimising the flash geometry in hot forging is studied with particular reference to flash thickness and flash–land width. The main goals to be pursued concern the minimization of the flash volume (i.e. the surplus of material necessary to fill the die cavity), with the aim to reduce material los…
HEURISTIC PROCEDURES FOR GROUP SCHEDULING
ABSTRACT The group scheduling problem is investigated, solving numerous small and large sized examples with eight sequencing algorithms. A new approach, basically consisting in the definition of real machines' idles for each group, utilizing allowed shifting of non critical activities, is proposed. Moreover the CDS multi-shot algorithm is extended to group scheduling.
Fractal dimension: A useful tool to describe the microgeometry of machined surfaces
Abstract The authors have utilized some concepts of fractal geometry to describe the complexity of profiles surveyed from surfaces worked by cutting. In particular an experimental analysis was carried out to investigate the influence of the worked material, cutting speed and cutting operation on the “fractal dimension” parameter. The obtained results show that this parameter is able to describe the irregularities of the profile on a small scale, which is important for an overall understanding of the functional behaviour of machined surfaces. Such descriptions cannot be derived from the more commonly employed parameters.
Sheet Metal Fastening by Self-Piercing Riveting
Erratum to: Guidelines for the use and interpretation of assays for monitoring autophagy (3rd edition) (Autophagy, 12, 1, 1-222, 10.1080/15548627.2015.1100356
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