Topic
Stamping
About: Stamping is a research topic. Over the lifetime, 22501 publications have been published within this topic receiving 83554 citations.
Papers published on a yearly basis
Papers
More filters
Patent•
07 Oct 1983
TL;DR: In this article, a line pattern of a photoresist film on the die face corresponding to the contour of the desired pattern was used to sharpen the edge into a knife edge.
Abstract: The invention provides a novel method for manufacturing a knife-edge die for stamping out a metal foil on an insulating base plate such as in the preparation of an electronic circuit board by a technique of photoetching. The method comprises a line pattern of a photoresist film on the die face corresponding to the contour of the desired pattern, subjecting the die face to a first etching to effect substantial side etching behind the photoresist film to leave an edge, removing the photoresist film and subjecting the die face to a second etching to sharpen the edge into a knife edge. The invention further proposes several improvements in the knife-edge die manufactured in the same principle of the method as above such as the adjustment of the depth of the inside recess surrounded by the knife edge with a filling material and knife-edge dies suitable for continuous stamping out provided with one or more of flat-headed presser dies for the preliminary bonding of the metal foil to the base plate prior to stamping out with the knife edge and one or more limiter dies provided on one or both sides of the knife edge in order to prevent unduly deep incision of the knife edge to the base plate.
42 citations
TL;DR: In this paper, the authors summarize the research activities conducted at the Advanced Materials Processing Laboratory at Northwestern University in the area of sheet metal forming and present an overview of their approach towards the system and a summary of individual projects in the areas of failure prediction, design and control of a variable binder force, and the segmented die design with local adaptive controllers.
Abstract: In sheet metal forming, external energy is transferred to sheet metal through a set of tooling to plastically deform a workpiece. The design of the tooling and its associated forming process parameters play important roles in this manufacturing process since they directly affect the quality and cost of the final product. With increasing demands from customers, government regulations, and global competition, the controllability and flexibility of stamping dies have been challenged. In this paper, we will summarize the research activities conducted at the Advanced Materials Processing Laboratory at Northwestern University in the area of sheet metal forming. An overview of our approach towards the system will be given followed by a summary of individual projects in the areas of failure prediction, design and control of a variable binder force, and the segmented die design with local adaptive controllers.
42 citations
TL;DR: In this article, a combined low-temperature rolling and warm stamping process was proposed for a Fe-5.6Mn-0.19C-1.2Al Alloy to improve the tensile ductility and surface quality of the stamped parts.
42 citations
Patent•
26 Jul 1972TL;DR: A stator core for rotary electric machines is formed by helically and closely winding a steel strip formed by stamping with equally spaced inner slots defining a plurality of equally spaced tooth portions as discussed by the authors.
Abstract: A stator core for rotary electric machines, which is formed by helically and closely winding a steel strip formed by stamping with equally spaced inner slots defining a plurality of equally spaced tooth portions. The steel strip is also formed with notches each on each side of the stem portion of each tooth portion for the purpose of minimizing the plastic deformation stresses induced at the time of winding it.
41 citations
TL;DR: In this article, the effects of material coil-to-coil variations on springback and thinning phenomena in a U-channel stamping process were investigated. And a finite element method-response surface methodology-Monte Carlo simulation-integrated approach was implemented to quantify such effects.
Abstract: A very critical issue for stamping operations is the improvement of process robustness. The reliability of final results, in fact, strongly depends on the intrinsic variability due to stochastic behavior of many parameters, namely, operative ones and material properties. A given process performance may undergo a variation around the value which would be obtained neglecting stochastic behaviors of the operative or material parameters (i.e., considering a deterministic parameters behavior). Such variation introduces a significant source of uncertainty within the process design: a possible consequence may be the rejection of some stamped parts. In this paper, reliability analyses aimed to evidence and quantify the effects of material coil-to-coil variations on springback and thinning phenomena is proposed. In particular, an aluminum alloy typical of automotive applications was considered and an S-shaped U-channel process was investigated. The stochastic analysis was performed within several operative windows at the varying of restraining forces. Formerly, a sensitivity analysis was carried out in order to evaluate the single effect of each selected material parameter and to screen the most influent ones. Subsequently, a finite element method-response surface methodology-Monte Carlo simulation-integrated approach was implemented to quantify such effects. The proposed methodology provides the possibility to powerfully analyze material variability effect on the final process quality, assisting the designer in a subsequent process optimization.
41 citations