Industrial Implementation of Practices for LDH Stability The University of Michigan

Format:

Conference/Event

Author/Creator:

Graf, Alejandro F., author.

Conference Name:

International Congress & Exposition (1993-03-01 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 1993

Summary:

The LDH (Limiting Dome Height Test) is widely used at Ford Motor Company stamping plants laboratories to monitor the formability of incoming sheet materials. Although the LDH test is very easy to implement and interpret, variability of the results and poor reproducibility between laboratories limit its acceptance. In this investigation, some of the causes of variability and differences between plant laboratories are discussed. Much of the experimental work was done at plant laboratories and the results are directly applicable to quality control (QC) machines.It was found that the binder force and the binder shape have a big influence on the results, and they should be carefully controlled. The binder cleaning procedure is also relevant to the test variability. Punch temperature has a much greater influence on QC machines than on research machines and a method for controlling the punch temperature in QC machines is presented. Finally, the influence of prior samples' material on the LDH value of a reference material is discussed

Notes:

Vendor supplied data

Publisher Number:

930816

Access Restriction:

Restricted for use by site license