Showing papers on "Stamping published in 1994"

Method for controlling a printer in order to obtain postages

Abstract: The invention relates to methods which involve the utilization of an office printer connected to a microcomputer in order to print legitimate postal marks. It comprises the use of a cartridge of special fonts (104) wherein are stored the stamping marks according to the standards provided for the printer (102). A known security component (204) is provided, on the one hand, to protect the access to the memory (202) contained in the cartridge and, on the other hand, to calculate for each print of a stamping mark a security mark which contains crypted information which are readable by the postal administration for authentication of the stamping mark. Thereby, the invention provides for the elimination of specific stamping machines and limits the handling operations to the manipulation of a small size cartridge.

System for stamping an optical storage disk

Abstract: An optical storage disk consists of a glass substrate (1) into which guide tracks (3) for servo-controlling the focussed light beams are directly stamped by a hot stamp process. After stamping, the glass substrate is thermally quenched in the stamping device to increase its breaking resistance through thermal curing. In order to achieve uniform guide tracks over the entire surface of an optical storage disk, flexible stamp stencils (35) in a flexible holder (34) are used whose curvature can be changed by applying hydro-static pressure. Suitable stamp stencils consist of monocristalline silicon disks with surface hardening, or of metal disks, structured in photolithographic processes. The stamp lands are made with bevelled edges to facilitate the separating of stamp and glass substrate after cooling.

Cooktop stamping having means for attaching heating elements and an integral trim ring

Abstract: A metal stamping for holding a glass ceramic cooktop, a control unit and a plurality of burner elements of an appliance having means for holding the glass ceramic cooktop, an element portion having a plurality of element holes wherein the burner elements are disposed and further having attachment means for securing the burner elements to the stamping, a control unit portion having means for attaching the control unit to the stamping, and a trim ring means for attaching the stamping to the appliance

Method of making aluminum sheet product and product therefrom

Abstract: A method of producing aluminum alloy sheet product includes casting a slab, homogenizing the cast slab, and hot rolling the homogenized slab to provide an intermediate gauge product. The temperature and other operating parameters of the hot rolling process are controlled so that the temperature of the intermediate gauge product exiting the hot rolling step is between about 500° F. and 650° F. Preferably, the temperature does not exceed 575° F. The intermediate gauge product is then subjected to a cold reduction of 45% to 70%, annealed, and cold rolled to final gauge. The combination of controlling the hot rolling to provide a desired exit temperature of the intermediate gauge product and annealing prior to cold rolling to final gauge minimizes or eliminates the appearance of ridging or roping line defects in the aluminum sheet product when subjected to further straining in a forming or stamping operation. An improved aluminum alloy sheet product is produced having a superior surface finish for use in automotive components such as hoods or deck lids.

3-D stamp forming of thermoplastic matrix composites

Abstract: In this investigation a mould with hemispherical cavity and 80 kN hydraulic press, allowing variable stamping speeds, are employed for experimentally studying of the 3-D stamp forming process of continuous fiber reinforced thermoplastic laminates. In particular, glass fiber (GF) reinforced polyetherimide (PEI) woven fabric made of sheath surrounded, polymer powder impregnated fiber bundles manufactured by Enichem, Italy, is used. Pre-consolidated laminates are heated by contact heating in an external heater up to about 120°C above the glass transition temperature (Tg) of the polymer matrix; they are then stamp formed in a cold matched metal tool. Typical cycle times (including preheating time of the preconsolidated laminates) are in the range of 3 min. Useful processing conditions, such as stamping temperature, stamping velocity and hold-down pressure required for stamp forming of this composite are determined. In addition the effect of die geometries (deformation radian) and original laminate dimensions are studied. The results describe the correlations between processing parameters and fiber buckling. Finally the thickness distribution in stamped parts are investigated in relation to different directions of fiber orientation.

Apparatus for securing component panels in a lighting fixture

Abstract: A lighting fixture includes one or more corner structures for connecting adjacent panels at their adjacent real or virtual corners or edges at predetermined angles to each other. The corner structures include sockets of which at least one includes a single flange member for adhering support on one side of lighting fixture panels with the other sockets each including at least a single flange member for adhering support on one side of lighting fixture panels. Adjacent ones of the sockets are attached to each other at cantilevered ends or at the bases of the flange limbs, or at combinations thereof. The corner structure can be fabricated from sheet metal by cutting and stamping the corner structure according to a predetermined pattern.

Material for protecting sheet metal during the sheet metal forming process

Abstract: A combination of materials comprised of an inner or core material and an outer material layer or coating on one or both sides of the core material whereby this combination of materials is to be used in conjunction with sheet metal forming equipment such as press brake and punch press machines to protect the sheet metal and equipment tooling during the sheet metal forming process as well as improve the quality of the finished sheet metal product.

Multiple stamping dies with cumulative stamping markers and method of stampings parts

Abstract: Stamping dies and method for stamping parts using multiple stamping stations with different bottom markers in successive dies that mark the part being produced at selected stations with different markings related to one another, which cumulatively provide an observable completed set of marks on a part such as one finally stamped to readily show whether or not the stamping has been properly executed and to identify any stamping station or stations that is not stamping to specification.

Self=stamping riveting machine for overlapping sheet metal components

Abstract: The machine uses a hollow rivet, engaged by a punch, a die whose cavity (10) contains a profiled pin (5) for deforming the sheet metal components. The component, facing the die, is thicker. The pin also expands the hollow rivet shaft (16). The components are held by a holder (5). The edge, bounding the die cavity, forms a vertical cutting rim (12), entering the thicker component (2) up to a preset depth during compression through the holder. During the riveting the hollow rivet shaft is firmly secured by deformation of the incised component on the profiled pin.

Method for making an aluminum clad leadframe and a semiconductor device employing the same

Abstract: A quad leadframe (22') for a CERQUAD is manufactured using conventional cladding and stamping technologies. A first metal layer (12) is provided with multiple cavities (14). A second metal layer (14) is clad to the first metal layer. A leadframe strip (22) can then be stamped from the clad metal. The leadframe has a leads (24) and bonding posts (28). The leads comprise two metal layers, and the bonding posts comprise only the second metal layer. The leadframe can then be used in the assembly of a semiconductor device (32). The portion of the leads external to the package body can be optionally etched to remove the second metal layer.

Workpart transfer mechanism for stamping press

Abstract: A workpart transfer assembly (10) shuttles workpart stampings from a forming die (14, 16) of one stamping press (12) to a remotely spaced successive forming die (14, 16) in another stamping press (12) while the two stamping presses (12) cycle in unison. The assembly (10) includes a base (18) stationed in a clearance between the two stamping presses (12). A dual drive and dual rail transfer shuttle (26) slides on the base (18) between two oppositely extending cantilever positions. A carriage (44) slides along the transfer shuttle (26). A dual screw drive mechanism drives the transfer shuttle (26) on the base (18) while at the same time driving the carriage (44) along the transfer shuttle (26), thereby effecting highly accelerated movement of the carriage. A lift screw mechanism is carried on the carriage (44) for raising and lowering a slide plate (60) during the shuttling operation. The slide plate (60), in turn, supports a pair of oppositely extending cantilevered arms (50) having suction cup ends (52) for grasping and releasing workparts to and from the forming dies (14, 16) and a central workpart rest platform (54).

Ferrous metal blade for curved stamping tool

Abstract: A stamping blade (1) of strip or bar form, for stamping tools producing curved cuts, has a holder portion, comprising a rear portion (2) and a transition portion (3), and a cutting portion (4) made of different alloys or materials of different chemical compsns. joined together by a filler-free metallic joint face (43). Pref. the holder portion (2, 3) consists of a hardened steel of compsn. (by wt.) 0.35-0.7% C, 1.0-2.5% Si, 0.4-2.0% Mn, 0.5-2.0% Cr, 0.01-0.5% V, opt. up to 2.0% total of other addns., and balance Fe and impurities, while the cutting portion (4) consists of a high speed steel of compsn. (by wt.) 0.75-1.2% C, 1.2-2.4% V, conventional amts. of Cr, Mo and/or W as well as Co and balance Fe.

Method for stamping heat-sensitive sheets

Abstract: A method for forming an item by partially fusing selected portions of two sheets together. A non-heat-sensitive barrier sheet is inserted between two heat-sensitive sheets. The sheets are stamped with a die to fuse portions of the heat-sensitive sheets together remote from the barrier sheet. The barrier sheet and waste heat-sensitive sheet material is removed to leave the item. The method has particular application to stamping envelopes from a clear flexible vinyl material in a single continuous stamping operation.

Optimal process control in stamping operation

Abstract: The optimal process variables in producing stamping parts are determined for a door inner panel through the Taguchi L9 experimental design. The variables considered in this work are the inner tonnage, the outer tonnage, and the punch speed. The experime..

Combined stamping die

Abstract: The utility model relates to a combined stamping die, comprising a convex upper die and a concave lower die. The upper die and the lower die are respectively connected by a plurality of plate-shaped die plate through a set of threaded bolts. The utility model has the advantages that the utility model can be used for making dies with various complex shapes, the machining accuracy is high, the manufacturing technique is simple, the production period is short, the cost is low, the assembly and the disassembly are convenient, and the transportation and the storage are convenient. The combined die can manufacture various stamping devices. The utility model is particularly suitable for manufacturing large thin-plate stamping devices.

A plane strain punch stretching test for evaluating stamping formability of steel sheets

Abstract: A simple simulative test was developed to evaluate the stamping formability of steel sheets in plane strain stretching deformation. The stamping formability was evaluated by the limiting punch height (LPH) value in the plane strain punch stretching (PSS) test compared to the minimum of the limiting dome height (LDHo) value in the hemispherical punch stretching test, the standard LDH test. The PSS test shows a stable plane strain deformation and a good reproducibility with less scattering data. Moreover, the LPH value in the PSS test ranks well the stamping formability of various sheet materials and shows good correlations with press performance.

Connection assembly for electric motor

Abstract: The assembly for enabling the electrical connection of an electric motor has a number of individual conductive tracks cut from a single sheet of metal. After cutting out the required shape to provide the necessary conductors, the metal cut-out is fastened to an insulating support and individual contacts are fastened to the terminals of electric and electronic components. The structure may be formed by stamping out the shape in the original metal sheet.

Method for the defined adjustment of the formability of a metal semi-finished product

Abstract: A method for the defined adjustment of the formability of a metal semi-finished product, particularly one in the form of sheet or strip materials, by means of laser irradiation for a subsequent forming process is known. In this method, the surface of the workpiece is subjected to laser irradiation, the workpiece and the laser radiation being shifted relative to one another in time in their coordinates. In order to develop such a method further, the workpiece is subjected continuously to laser radiation in such a way that a trace representing a recrystallisation zone is produced on the workpiece in the region of a desired bending, a desired stamping and bending or a deep-drawing deformation to be carried out.

Tandem press system for manufacture of stator and rotor cores

Abstract: A tandem press system for the high speed manufacture of rotor cores and stator cores of electric motors The tandem press system includes a rotor press and a stator press arranged in series for stamping out laminations from a web of stock material and pre-assembling them into rotor cores and stator cores, respectively Structure is provided between the rotor and stator press to maintain control of the web and provide a substantial barrier to transmission of vibrations in the web to the stator press The rotor and stator presses are capable of shifting from stamping one type of lamination to stamping another type of lamination without any interruption in the operation of the presses

Producing precision components by stamping stages

Abstract: At least two material strips are fed in parallel to a mechanism which positively drives each strip at rates predetermined by a feed unit. The strips thus synchronised are fed in parallel to a common stamping tool within a stamping press. The resultant stampings are joined into a precision component.The driver mechanism incorporates at least two roll gaps (WA, WB) formed by roll pairs (8, 10; 9, 11) for the two material strips. At least two rolls (10, 11) are positively coupled in the strip feed direction. The roll diameters are chosen (or are adjustable) so that the desired feed rates are attained.Pref. the feed of the first strip is decoupled from the displacements imposed on the second strip by the stamping tool. The width of the roll gaps (WA, WB) and hence the pressure on the strips exerted by means of two adjustment mechanisms is independently variable.