03 Edm questions

Pagina 1

DOMANDE EDM 2023-01-20 Consider the different technologies studied in the course for the cutting of 2d metal sheets, in some cases the kerf is not symmetric, (i.e. the tapers of the left and right walls are different). Among the following sentences, select the CORRECT ones (multiple choice possible): o It sometimes happens as a defect in melt and blow laser cutting, when the M2 parameters is too high o It very frequently happens as a defect in plasma arc cutting, because of the gas swirling rotation o It is frequently obtained intentionally, so to have one wall with no taper on the part side and the other wall (the scrap side) with a large taper on it o It sometimes happens as a defect in wire EDM, because of the Lorentz force o It very frequently happens as a defect in AWJ, because of the asymmetry of the suction process 2023-02-10 A company needs to manufacture a surgical device made of a very thin (0,1 mm) sheet, with the shape shown in the figure. The surface quality of the incoming rectangular sheets is bright and mirror polished, with Ra<0,2 microns. The device is required by a clinical trial. 500 sample parts must be produced in stainless steel AISI304. Among the following considerations, select the one (if any) which is NOT correct. (1,5 punti) o AWJ machining would be an excellent solution because of its flexibility (quick setup and process design times) and machined quality. o LBM, laser beam cutting is a feasible option, although it would require some trial and error to fine tune the parameters, problematic because of the reflectivity of the material. o PAC, Plasma arc cutting is a technologically feasible alternative, but there is a high risk of poor edge quality and thermal alterations (distortion) of the product. o WEDM would be an excellent solution,…