Evaluation of selected parameters in blanking
2018
Brozek, M., Czech Univ. of Life Sciences, Prague (Czech Republic) | Novakova, A., Czech Univ. of Life Sciences, Prague (Czech Republic)
The course teaches students, among other methods, also shearing technology. A laboratory exercise was prepared, in which cylindrical shaped cuts of two different metallic materials and of three various thicknesses were made using a cutting tool (blanking punch and blanking die) and a universal testing machine. The blanking punch was 10.0 mm in diameter, the blanking dies 10.3 mm or 10.8 mm diameter. The blanking was made of Cu 99.9 sheet metal of 5 mm thickness and Al 99.5 sheet metal with thickness of 3 mm, 5 mm and 10 mm. The course of the instant shear force in response to the displacement of the push plates was recorded during the experiment. The objective of the performed experiments was to determine the real and theoretical maximum shear force and work required to cut. The quality of the shearing area was assessed by the ratio to the size of the area burnish and fracture from the point of view of the effect of clearance between the blanking punch and the blanking die (Al 99.5, thickness 10 mm, punch Ø 10.0 mm and die Ø 10.3 mm or punch Ø 10.0 mm and die Ø 10.8 mm), from the point of view of the type of the cut material (Cu 99.9 and Al 99.5, thickness 5 mm, punch Ø 10.0 mm and die Ø 10.3 mm) and from the point of view of the thickness of the cut material (Al 99.5, thickness 3 mm, 5 mm and 10 mm, punch Ø 10.0 mm and die Ø 10.3 mm).
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