Stamping

About: Stamping is a research topic. Over the lifetime, 22501 publications have been published within this topic receiving 83554 citations.

Apparatus for stamping indicia on materials

Abstract: In a marking system for stamping materials such as aluminum strip, a pulse of determined energy is supplied to a solenoid, to impart a determined kinetic energy to a die. The die is guided to dissipate substantially all of this kinetic energy in the deformation of the material being stamped. The pulse of energy applied to the solenoid may be controlled by a programmable computer, programmed to control the duration of time that a current is applied to the solenoid. The computer may control a plurality of such solenoids, controlling the times and relative numbers of operation of each of the solenoids.

Incremental Metal Forming Processes in Manufacturing

Abstract: Incremental sheet metal forming (ISMF) has demonstrated its great potential to form complex three-dimensional parts without using component-specific tools against the conventional stamping operation. Forming components without component-specific tooling in ISMF provides a competitive alternative for economically and effectively fabricating low-volume functional sheet metal products; hence, it offers a valid manufacturing process to match the need of mass customization, which is regarded as the future of manufacturing. In ISMF process, sheet is clamped in a fixture/frame with an opening window on a programmable machine, and a hemispherical/spherical ended tool is programmed to move in a predefined path giving shape to the clamped sheet by progressively deforming a small region in incremental steps. Although formability in incremental forming is higher than that of conventional forming, the capability to form components with desired accuracy and surface finish without fracture becomes an important requirement for commercializing the ISMF processes. This chapter presents various configurations developed to incrementally form the sheet metal components, experimental as well as numerical methods for estimating forming limits, procedures for enhancing the accuracy, and methodologies for tool path generation.

Method of hot stamping intraocular lens bodies

Abstract: A method for manufacturing an intraocular lens from a cell cast sheet of high molecular weight polymethylmethracrylate (PMMA). A lens blank having a lens generation area with a surface contoured to correspond to the desired contour of the finished lens is machined from the sheet of PMMA to a predetermined precompensated size larger than desired to acccommodate normalizing shrinkage. The lens blank is normalized by heating the blank in a vacuum oven. The vacuum is released from the oven by introducing dry nitrogen. A stamping die is provided. An optical embossing surface of the stamping die is contoured as a physical negative of the lens generation area and bears a physical negative of the desired optical surface structure of the lens, such as a multifocal diffractive zone plate. The embossing surface of the stamping die is forced into engagement with the surface of the lens blank at a predetermined stamping pressure and for a predetermined stamping dwell time. Sufficient heat or ultrasonic energy is applied to the lens generation area of the lens blank to heat the lens generation area to a temperature between the glass transition temperature and the melt temperature of the polymer, and emboss the surface structure onto the lens generation area. The embossing surface of the stamping die is removed from the lens blank following the expiration of the stamping dwell time.

CASNS—a heuristic algorithm for the nesting of irregular-shaped sheet-metal blanks

Abstract: This article reports on the design and implementation of a computer-aided sheet nesting system (CASNS) for the nesting of two-dimensional irregular-shaped sheet-metal blanks on a given sheet stock or coil stock. The system is designed by considering several constraints of sheet-metal stamping operations, such as bridge width and grain orientation, and design requirements such as maximising the strength of the part when subsequent bending is involved, minimisation of scrap, and economic justification for a single or multiple station operation. Through many practical case studies, the system proves its efficiency, effectiveness and usefulness.