14 research outputs found
Optimization of a Classical Stamping Progression by Modal Correction of Anisotropy Ears
This work is a development from the Inetforsmep European project. We proposed
to realize a global optimization of a deep drawing industrial progression (made
of several stages) for a cup manufacture. The objectives of the process were
the thickness decrease and the geometrical parameters (especially the height).
This paper improves on this previous work in the aim of mastering the contour
error. From the optimal configuration, we expect to cut down the amount of the
needed material and the number of forming operations. Our action is focused on
the appearance of unexpected undulations (ears) located on the rim of the cups
during forming due to a nonuniform crystallographic texture. Those undulations
can cause a significant amount of scraps, productivity loss, and cost during
manufacture. In this paper, this phenomenon causes the use of four forming
operations for the cup manufacture. The aim is to cut down from four to two
forming stages by defining an optimal blank (size and shape). The advantage is
to reduce the cost of the tool manufacturing and to minimize the needed
material (by suppressing the part flange). The chosen approach consists in
defining a particular description of the ears' part by modal decomposition and
then simulating several blank shapes and sizes generated by discrete cosine
transformation (DCT). The use of a numerical simulation for the forming
operation and the design of an experiment technique allow mathematical links
between the ears' formation and the DCT coefficients. An optimization is then
possible by using mathematical links. This original approach leads the ears'
amplitude to be reduced by a factor of 10, with only 15 numerical experiments.
Moreover, we have limited the number of forming stages from 4 to 2 with a
minimal material use
Monographie sur le tolérancement modal
In order to analyze the geometric quality of any surface we have defined a shape language that can be used in tolerancing and metrology softwares. Modal parameters defines a shape langage allowing to describe geometric variations associating undulation, form, position, orientation and dimensions. It defines a geometric basis, easy to use by a simple user or deeply by an expert. The principal properties of this basis are the exhaustiveness and the metric of the parameters. We can use either natural mode shapes that can be modified by technological mode shapes
Proceedings of the 2018 Canadian Society for Mechanical Engineering (CSME) International Congress
Published proceedings of the 2018 Canadian Society for Mechanical Engineering (CSME) International Congress, hosted by York University, 27-30 May 2018
NASA Tech Briefs, Winter 1983
Topics include: NASA TU Services: Technology Utilization services that can assist you in learning about and applying NASA technology. New Product Ideas: A summary of selected innovations of value to manufacturers for the development of new products; Electronic Components and Circuits; Electronic Systems; Physical Sciences; Materials; Life Sciences; Mechanics; Machinery; Fabrication Technology; Mathematics and Information Sciences