Non-centrosymmetric Section Forming Shoulders in Packaging Machines

摘要

The mathematical description of a non-centrosymmetric section, trapezoid shoulder is presented and the equations of the bending curve, the shoulder curved surface and the fringe curve are developed. Triangular, flat-round, rectangular and round shoulders are discussed as special cases of the non-centrosymmetric shoulder. To confirm the validity of the mathematical description, 3-D shoulders are modelled on computer, and actual shoulders are manufactured by rapid manufacturing machine.