Abstract
The push-back blanking is easy for achieving perfect burr-free blanking. This method consists of two stages, that is, the 1st stage for making the half-blanked product, and the 2nd stage for pushing it back to the original thickness. Successful blanking conditions for burr-free are investigated already. Applying the method to the manufacturing processes of precise mechanical parts more widely, dimensional accuracy of burr-free blanked products should be known. In this research, influence of material constraint conditions on dimensional error and shear droop is investigated. As the results, it is found that the employments of material constraint at 1st stage, strong blank holder and counter punch, improve the dimensional accuracy and reduce shear droop.
