Shear droop is a phenomenon that occurs on the surface of a product that was machined by shearing. When the machined material is cut using a punch and die, the material is pulled by the tensile force produced on the cut surface, producing a smooth surface. This smooth surface is known as droop.

The shear droop is associated with the initial compression by and the subsequent clearance of the punches and dies. Results are obtained for various clearances and initial compressions in the fine-blanking process for high-strength steel, and the …

Jan 1, 2018 · A large shear droop generated in the convex portions of blanked components leads to functional problems, such as a decrease in the effective thickness of gear parts. In this study, the cause of this issue was investigated by comparing half-blanked workpieces with circular and rhombic profiles.

Shear droop: Smooth surface caused by the surface of the material being pulled. Sheared surface: Glossy surface with vertical stripes. There are subtle scratches caused by the punch cutting during shearing and friction between the deposited metal and the material.

The shear droop is associated with the initial compression by and the subsequent clearance of the punches and dies. Results are obtained for various clearances and initial compressions in the fine-blanking process for high-strength steel, and the …

In common punching operations, the cut surface is formed in the material in the sequence of droop → shear cross-section → fracture cross-section → burr, as shown in Fig. 1.

Jun 7, 2020 · Shearing processes of high strength steel sheets increasingly applied to lightweight automobile parts were reviewed. With the increase in strength of the high strength steel sheets, shearing operations become hard.

In this study, we investigated stability of the sheared surface length of the cross section in micro-pierced holes. The inner diameter of the holes and maximum piercing forces were measured in order to evaluate the effect of the grain size in the micropiercing process.

Mar 1, 2011 · In the present calculations, an adaptive remeshing technique for FEM is used to create fine sheared surfaces. The shear droop is associated with the initial compression by and the subsequent...

A large shear droop generated in the convex portions of blanked components leads to functional problems, such as a decrease in the effective thickness of gear parts.