Effect of Rigidity of Die and Press on Blanking Accuracy of Electronic Machine Parts

Abstract

Abstract Blanking accuracy is decided by the relative displacement of an appear die to a lower die in the blanking. Deformation of a die-set subjected to an accentric load in a press is analysed, and the bending moment M and the lateral force Q acting on the end of each guide post are expressed by the inclination θ and the lateral displacement DX of the upper die. In the experiment, a die-set of sub-guide construction is installed on a 1250kN straight side frame press and 100kN C-type frame press, and θ DX are measured user static loading and dynamic loading of 100sdm. The calculated M and Q using the measured θ and DX show that the M and Q acting on the guide post end are smaller on the straight side frame press than on the C-type frame press though the capacities of both presses are almost the same. The analytical method proposed in this paper can be used in the selection of a press suitable to a given die set and a given accentric load.