Study and Design of Sheet Metal Bending Springback Adjustable Die

A kind of U type 90°or V type 90°bending springback testing die was set up to discuss the bending springback . The springback of material can be masteried through setting up of bending springback adjusting test die without prior calculation . In order to adjust the bending angle , the T type slide seat and bending press plate were used and the adjusting of bending radii was implemented by replacing the adjusting axis of bending radii. At first, if the springback value of the sheet metal made sure for the die design , then the die was designed , the large of works for repaired and tested die were reduced and it will be the `most convenient for the die designer.

The Heron-Allen & Earland Type Slide Collection of Foraminifera in the British Museum (Natural History)

Heron-Allen & Earland collaborated on the study of the Foraminifera over a period of 25 years. During this partnership they amassed a large faunal reference collection (The Type Slide Collection) which was presented to the British Museum (Natural History) between 1926 and 1943. An introductory biography of Edward Heron-Allen and Arthur Earland shows that they came from very different backgrounds and had very different capabilities, but were united by a mutual interest in foraminifera; their dedication made them the foremost British foraminiferologists of the time. The appearance and content of the collection are described with background information on how these slides were prepared. Heron-Allen & Earland’s own method of curation, using a series of detailed indices (Keys), is also explained. The history of the Type Slide Collection, including its transfer from Selsey to the Museum to save it from destruction, is recounted and its importance, as a national collection, assessed.