This preview shows page 1. Sign up to view the full content.
Unformatted text preview: sed. The commercial thickness tolerance was ± 0.09 mm. The actual bend allowance has been determined as described in 3.1.d so that the flat pattern could be calculated. After laser cutting, a code number was engraved in each sample to keep track of its precise location within the initial sheets. The samples were oriented so that all subsequent bend lines were parallel to the rolling direction. a. Sheet thickness. For each sample, the thickness has been measured at the four corners with a digital micrometer as described in 3.2.a. b- Workpiece dimension. The lengths have been measured at both sides of the bend lines for each sample with a digital calliper as described in 3.2.b. c- Springback angle determination. Due to the high magnitude of influence, springback angles should be determined to eliminate a large systematic error caused by this factor. A press brake that allows for adaptive bending has been used to impose a single bend angle of 90° before unloading and to measure the angle after unloading by a device as described in 3.2.c. The difference between both angles is...
View Full Document
This note was uploaded on 08/03/2010 for the course DD 1234 taught by Professor Zczxc during the Spring '10 term at Magnolia Bible.
- Spring '10
- The Land