Method and apparatus for making a part by first forming an intermediate part that has donor pockets in predicted low strain areas adjacent to predicted high strain areas

摘要

A method of forming a part that has areas of high strain and predicted areas of low strain from a blank and method of designing a die for forming such a part. Predicted areas of low strain are identified that are adjacent to predicted areas of high strain. A pre-forming die is designed to form the blank to provide a donor pocket in an intermediate part in a predicted low strain area that is adjacent to the predicted high strain area. The donor pocket of the intermediate part is drawn into the predicted high strain area while forming the intermediate part into the part.

主权项

1. A method of forming a part that has a predicted area of high strain and a predicted area of low strain from a blank comprising:
forming the blank between a first upper die and a first lower die that each include a plurality of donor pocket forming areas to provide a plurality of donor pockets within an intermediate part in a plurality of predicted low strain areas, each of the donor pockets immediately adjacent to a plurality of predicted areas of high strain, and each of the donor pockets having an arcuate cross-section; and on a second lower die, flattening the donor pockets and drawing additional metal afforded by the donor pockets into the predicted high strain areas while forming the intermediate part into the part.