Stamping

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

Die materials, hardening methods and surface coatings for forming of high, extra high and ultra high strength steel sheets (HSS/EHSS/UHSS)

Abstract: During the past years, large efforts have been made at Volvo Cars to establish a scientific and systematic approach to selection of die materials, hardening methods and surface treatments/coatings. These efforts were initiated, since both new higher strength sheet materials and new die materials with better performance were introduced. Both these higher strength sheet materials and higher performance die materials needed to be industrialized. Volvo cars transferred to a so-called Dry Presshop several years ago. This means that only the rust protection oil applied by the material supplier to the sheet prior to delivery is allowed as the stamping lubricant. No additional lubricant can be accepted. This transfer is done with regard to environmental improvement and a lean production philosophy. "Trouble-shooting" (reduction of abrasive and adhesive die wear) by using additional lubrication is therefore not possible anymore.In this investigation 1.20 and 1.95 mm thick uncoated and hot-dip galvanized sheets of DP600, DP800 and DP1000 were tested. The wear behaviour of the die materials Sverker 21 (D2), Calmax, Sleipner, Weartec, Vanadis 6 and Vancron 40 were studied. Uncoated, plasma-nitrided, PVD-coated (CrN and TiAlN) versions of dies made in the above-mentioned materials were tested.The tests were carried out both in laboratory in a U-bend test equipment and in real stamping production. Based on the results obtained in laboratory and production tests, guidelines were established for selection of die materials and surface treatments in stamping of DP600, DP800 and DP1000. These guidelines are described in the present paper.

Cold foil printing equipment

Abstract: The invention provides cold foil printing equipment, which comprises a printing material feeding mechanism and a printing material collecting mechanism, wherein a first printing material delivery mechanism, a coating mechanism, a second printing material delivery mechanism, a press-in mechanism, a curing mechanism and a third printing material delivery mechanism are sequentially arranged between the printing material feeding mechanism and the printing material collecting mechanism; a hot stamping foil uncoiling mechanism is arranged above the second printing material delivery mechanism; and ahot stamping foil coiling mechanism is arranged above the third printing material delivery mechanism; the press-in mechanism comprises a coining roll and a transfer roll; the hot stamping foil uncoiling mechanism comprises an uncoiling roll and an uncoiling roll shaft; the hot stamping foil coiling mechanism comprises a coiling roll and a coiling roll shaft; a tension roll and a metal drawing roll are arranged between the coining roll and the uncoiling roll and the coiling roll; the coining roll is controlled by a jump clutch; the metal drawing roll, the uncoiling roll and the coiling roll are driven by a servo motor; and the servo motor is controlled by an electronic jump control system. The equipment can reduce the waste of the hot stamping foil to a maximum degree.

Combination mobile computer shell and its fabrication method

Abstract: A method of fabricating a mobile computer shell by: stamping, milling and drilling a metal sheet member into a shaped shell, fixedly securing different positioning members to the shaped shell at locations subject to the computer parts to be held by means of bonding or welding, and covering a plastic cover sheet on the shaped shell after the installation of the positioning members in the shaped shell.

Fork stamping of pristine carbon nanotubes onto ferromagnetic contacts for spin-valve devices

Abstract: We present a fabrication scheme called 'fork stamping' optimized for the dry transfer of individual pristine carbon nano- tubes (CNTs) onto ferromagnetic contact electrodes fabricated by standard lithography. We demonstrate the detailed recipes for a residue-free device fabrication and in-situ current annealing on suspended CNT spin-valve devices with ferromagnetic Permalloy (Py) contacts and report preliminary transport characterization and magnetoresistance experiments at cryogenic temperatures. This scheme can directly be used to implement more complex device structures, including multiple gates or superconducting contacts.