Abstract
This paper deals with the countersinking process which permits to modify the entrance of an existing drilled hole and to obtain the screw hole countersink. Nevertheless forming kinematics during countersinking process was studied as a function of blank-holding conditions. The effect of blank-holding on the countersinking process was investigated using numerical and experimental analysis. An axisymmetric elasto-plastic finite element model was developed. Four geometrical changes were identified in the workpiece shape: the raise of the outer edge, the retraction of hole diameter, the axial expansion of the sheet near the obtained countersink and the radial expansion of workpiece. Finally, a recapitulative table was found to give a range of each parameter at different blank-holding conditions DOI: http://dx.doi.org/10.5755/j01.mech.23.3.14071
Highlights
PunchCountersinking is a process used in sheet metal forming
Efforts are secondly concentrated on the forming kinematics during countersinking process
It was found that the change in blank-holding does not affect the punch load-punch displacement relationship at the beginning of the process
Summary
Countersinking is a process used in sheet metal forming. This process consists of forming a truncated hole. The obtained internal shape is called countersink and it is used to locate a rivet or screw head. When placed in conical hole, the head of these components must sit flush with the surface with the surrounding material. The sheet is rigidly clamped around its periphery by a blankholder, and a truncated punch concentrates deformation to enlarge the side of existing hole Fig. 1. Workpiece performed by countersinking are known by their high mechanical properties and their low cost beside the low material waste and the high productivity
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