Showing papers on "Stamping published in 1996"

Apparatus and method for stamping a surface

Abstract: An apparatus (100) including a support structure (104), a flexible stamp (106) having a stamping surface (110) including a predetermined pattern disposed opposite the support structure (104), a pressure controlled chamber (112) disposed above the support structure (104), and a mechanical attachment (114) affixed to the flexible stamp (106). A method is provided for stamping the surface (101) of an article (102) including the steps of i) placing the article (102) on the support structure (104) within the pressure-controlled chamber (112), ii) wetting the stamping surface (110) with a solution containing a self-assembled monolayer-forming molecular species, iii) aligning alignment patterns (118) on the flexible stamp (106) with alignment patterns (124) on the surface (101) of the article (102), iv) controllably contacting the wetted stamping surface (110) with the surface (101) of the article (102) by changing the pressure differential across the flexible stamp (106) so that contact commences at the center of the flexible stamp (106) and proceeds outwardly in a controlled manner, and v) removing the stamping surface (110) from the surface (101) of the article so that a self-assembled monolayer (134) having the predetermined pattern is formed on the surface (101) of the article (102).

Plastic Bending: Theory and Applications

Abstract: Engineering theory of elastic-plastic bending of beams mathematical theory of plastic bending large elastic-plastic deflection of flexible bars cylindrical bending of strips numerical methods for single-curvature bending axisymmetric bending of circular plates pressing circular plates into semi-spherical dies biaxial bending and stamping of rectangular plates numerical methods for double-curvature bending wrinkling of circular plates and flanges during forming other applications of theory of plastic bending a brief review of studies on plastic buckling of plates and shells, and problems for further studies.

Accommodation of Springback Error in Channel Forming Using Active Binder Force Control: Numerical Simulations and Experiments

Abstract: Springback in a forming process is due to the elastic deformation of the part during unloading This manufacturing defect can be accounted for through proper tooling design or through proper design and control of the magnitude and history of restraining force Using finite element analyses of the process : (1) the effects of restraining force on the springback phenomena when stamping channels from aluminum sheet are investigated ; (2) a strategy to control the binder force during the forming operation in order to reduce springback and simultaneously avoid tearing failure is described ; and (3) a binder force control strategy which provides robustness in the presence of process parameter uncertainty is implemented The process history and controller designed using finite element analyses is then experimentally verified : excellent agreement between simulation and experiments is obtained A binder force history, which leads to a significant reduction in the amount of springback incurred by the formed part without reaching critical stretching conditions, was proposed Although an optimal forming history was found, in order to ensure that part shape error remained minimized even in the event of variations in processing parameters such as friction, a closed-loop control algorithm was developed whereby the binder force is altered during the process in order to provide a robust, repeatable stretching history Experiments were performed using a double-action servo-controlled process and were found to produce the desired results demonstrating both the accuracy of the numerical simulation and the success of the proposed active-binder force control method to obtain net shape

Thermal transfer sheet, and image element formed thereby

Abstract: PROBLEM TO BE SOLVED: To provide an ID card manufacture process by which an ID card being excellent in durability and forgery preventive capability, can be easily made, and of which the maintenance is simple. SOLUTION: For this heat transfer sheet, on the side having a release property of a releasable supporting body, a layer comprising of an acrylic based ultraviolet ray hardening resin, an intermediate layer comprising of a polyvinyl butyral resin of which the degree of polymerization is 1000 or higher or a thermally hardening resin of polybutiral, and a bonding layer comprising of a urethane modified ethylene ethyl acrylate copolymer and a polyacreylic ester copolymer, are provided in order. Then, after providing a transparent inorganic thin film on the ultraviolet ray hardening resin layer or the intermediate layer, a stamping is applied to form a transparent hologram, or the stamping is applied on the ultraviolet ray hardening resin layer or the intermediate layer, and a transparent inorganic thin film is provided to form the transparent hologram. Also on an image or a printed surface side of the base body wherein at least one being selected out of a certification-identification image, an attribute information image and a formed printing, is printed, a protective layer is formed by using the previously mentioned heat transfer sheet.

Integrated seal for a PEM fuel cell

Abstract: The invention provides a polymer electrolyte fuel cell with distributor plates which are made of an elastic, plastically deformable material, particularly of graphite foil, and which have integrated gas or liquid ducts. In order to seal off the gas or liquid spaces with respect to one another in a simple and reasonably priced manner, elevated portions are integrated in the distributor plates made of an elastic, plastically deformable material. The distributor plates with an integrated seal can be produced by stamping using a stamping tool having corresponding elevations for forming the gas or liquid ducts and corresponding indentations for forming the sealing arrangement.

Flat gasket and method of producing the same

Abstract: The invention relates to a flat gasket, on the main sealing faces of which are arranged one or several narrow flat sealing ridges, in the region of which an increased surface pressure and deformability are generated, whereby improved micro-sealing is attained. The invention further concerns a method for producing stamping moulds, in particular for stamping said flat gaskets according to the invention.

Method of forming and piercing a tube

Abstract: A metal tube is cold formed into a stamped member by filling the tube with a liquid change-of-state material, freezing the change-of-state material, sealing the tube containing the solid change-of-state material, and stamping the tube in a die The change-of-state material compresses during the stamping step to force the walls of the tube to conform to the die cavity, eliminating the need to pressurize the tube prior or subsequent to stamping Additionally, the solid within the tube provides support to the wall of the tube during a piercing step to form a hole in the tube having less deformation surrounding the hole than a comparative tube pierced without having the solid fill After the stamping or piercing steps, the change-of-state material is melted and drained from the tube Further, a tube is pierced by forming an outwardly bulged area and piercing the tube in the outwardly bulged area while simultaneously depressing the tube to substantially flatten the outwardly bulged area

Embossed pattern stamping apparatus

Abstract: The present invention is directed to an apparatus which is suited for use by women, children and the like who have limited physical strength to continuously stamp embossed patterns with clear outlines with the same spacing. A press roller (1) is provided with an embossed pattern stamping die on a circular external circumferential surface, with its rotating shaft (101) supported by bearings at a specific position, and is caused to perform axial rotation by a rotating drive force applied from the outside. A receptacle portion (2) faces opposite the external circumferential surface of the press roller (1), with its opposing surface constituted as a flat surface or a convex surface to form a gap (4) between itself and the press roller (1) where a sheet-like object to be stamped is to be inserted.

Alternate pinch bolt yoke construction

Abstract: An improved construction for a pinch bolt yoke for use as a flexible coupling in a vehicle steering system includes two separate components, a block and a stamping. The block includes front and rear surfaces, upper and lower surfaces, opposing side surfaces, and edges between the surfaces. The block includes a longitudinal axis extending between the front and rear surfaces. The block further includes a cutout to accommodate a transverse bolt. The cutout extends across a portion of the upper surface in a direction generally perpendicular to the longitudinal axis. The block further includes a bore to receive a shaft. The bore extends through the block between the front and rear surfaces in a direction generally parallel to the longitudinal axis. The stamping is adapted to receive the block. The stamping includes a base and a pair of arms extending perpendicularly from the base. The stamping further includes a front surface and a rear end, upper and lower surfaces, and opposing side surfaces. A transverse axis extends between the side surfaces. The stamping further includes a pair of apertures formed through the lower front corner of each arm. The apertures are aligned with one another in a direction parallel to the transverse axis, and they are adapted to receive a transverse bolt. The stamping further includes a pair of holes formed through the rear end of each arm. The holes are preferably aligned with one another in a direction parallel to the transverse axis, and they are adapted to receive a pair of opposed bearings.

Gambling chip and method of marking same

Abstract: A gambling chip includes a decorative pattern provided on at least one side thereof and on an edge thereof. The pattern is formed by pressure pad marking, i.e., applying an ink pattern to a deformable head and stamping the pattern on the chip. Repeated stamping of different color inks can create different patterns. A layer of varnish is also applied to the chip, either between ink layers or above or below all of the ink layers.

Bottom plate anchor for building frames

Abstract: A bendable metal stamping has upstanding arms adapted to overlie the narrow dimension of a wooden stringer in use as a bottom plate of a building frame. The stamping has legs extendable toward the perimeter of the building and are attached to the floor. The stamping is bendable along a line parallel to the bottom edge of the inner one of the arms and the inner edge of the legs.

Method of oriented depositing chemically defined bodies

Abstract: A method is proposed with which chemically defined bodies can be deposited on a substrate. Therefore, the bodies are fixed with a predetermined orientation on a stamping means which is then approached to the substrate whereby the bodies are deposited. While releasing the stamping means the bodies remain on the substrate keeping their orientation.

Process for the machining of stamping parts photochemically etched out of a carrier base, and stamping webs obtained therefrom

Abstract: The invention relates to the machining of cutting (stamping) edges which are etched photochemically out of a carrier base and by means of which labels consisting of label material adhering releasably to a supporting web are to be cut (stamped) as a result of the rolling of the cutting edges of the label material, wherein the cutting edges are given a triangular cross-section having fluted sides by milling by means of a frustoconical milling cutter engaging the longitudinal sides of the cutting edges and rotating about its axis. The invention also relates to cutting edges obtained by the process.

Process for the cutting or stamping of individual parts from an animal skin

Abstract: A process for cutting or stamping individual parts from an animal skin in which the contours of the individual parts are stored in a computer and can be assembled to form a cutting pattern, and, for optimizing the cutting, the cutting pattern is established individually as a function of the quality of the skin and is projected by a projection device onto the skin, with which the advantages of large-area nesting can be combined with the advantages of small-area cutting or stamping.

Quantifying design and manufacturing robustness through stochastic optimization techniques

Abstract: Critical design decisions are often made during the detailed design stage assuming known material and process behavior. However, in net shape manufacturing processes such as stamping, injection molding, and metals casting, the final part properties depend upon the specific tool geometry, material properties, and process dynamics encountered during production. As such, the end-use performance can not be accurately known in the detailed design stage. Moreover, slight random variations during manufacture can inadvertently result in inferior or unacceptable product performance and reduced production yields. These characteristics make it difficult for the designer to select the tooling, material, and processing details which will deliver the desired functional properties, let alone achieve a robust design which is tolerant to process variation. This paper describes a methodology for assessing the design/manufacturing robustness of candidate designs at the detailed design stage. In the design evaluation, the fundamental sources of variation are explicitly modeled and the effects conveyed through the manufacturing process to predict the distribution of end-use part properties. This is accomplished by utilizing optimization of manufacturing process variables within Monte Carlo simulation of stochastic process variation, which effectively parallels the industry practice of tuning and optimizing the process once the tool reaches the production floor. The resulting estimates can be used to evaluate the robustness of the candidate design relative to the product requirements and provide guidance for design and process modifications before tool steel is cut, as demonstrated by the application of the methodology for dimensional control of injection molded parts.

Protective covering for a shoe outersole

Abstract: A method of manufacturing a shoe having an outersole with a removable protective covering, including the steps of applying a sheet of protective covering to a sheet of outersole material with adhesive to form a composite sheet; applying printed indicia on the protective covering at predetermined locations; stamping out the composite sheet to form a plurality of outersoles, each having the protective covering and the printed indicia to form finished outersoles; and attaching each of the finished outersoles to a shoe upper to form a shoe so that the protective covering is removable.

Roll forming machine for an indeterminate length metal roof panel

Abstract: A machine (90) for forming a metal roof panel (50) of indeterminate length from a uniform width supply strip (96) of sheet metal having a pair of parallel straight longitudinal edges (98, 100) The machine (90) has a series of spaced forming stations (102) each having upper and lower shaping rollers between which the sheet metal strip (96) is passed so as to impart a desired shape to the sheet metal strip (96) which is uniform along the length of sheet metal strip (96) after it exits the apparatus A stamping station (104) located in the path of the sheet metal strip (96) before the series of spaced forming stations (102) is effective to form linear impressions (74) in the sheet metal strip (96) The linear impressions (74) are transverse to the longitudinal edges (98, 100) of the sheet metal strip (96), with each such impression (74) having its lateral extent limited such that the succeeding series of shaping rollers do not impinge thereon

Stamping die with attached plc

Abstract: A metal stamping die for a punch press is provided that has a programmable logic microcontroller fixed directly to the die body of the stamping die. The programmable logic microcontroller is encased in epoxy resin to protect it from contaminants and to protect it from vibration which will occur as the punch press operates to stamp metal parts. Sensing devices on the stamping die are electrically connected through passages in the stamping die to the programmable logic microcontroller. An annunciator panel is positioned on the programmable logic microcontroller and has light emitting diodes to indicate the type of malfunction in the die which causes the punch press to stop when a malfunction occurs.

Influence of weld orientation on forming limit diagram of similar/dissimilar thickness laser welded joints

Abstract: The drive towards reduced car body weights and improved safety could be met by the introduction of tailored welded blanks at the design stage. A tailored welded blank is a single panel formed by welding two or more different materials together to form a single composite sheet, which is then subsequently pressed. The materials within a single panel can have different properties, such as high strength or high corrosion resistance, and may even be of different thicknesses. The problems associated with the production of such panels come mainly at the stamping stage, in the form of weld or parent material failure. Work has begun with small scale cupping tests of laser welded samples to establish the forming behaviour of the weld. Forming limit diagrams have been constructed for several welded and unwelded material combinations to establish the limiting strain conditions during a forming operation

Process and device for adapting the position of printing plates to the deformation of the paper to be printed

Abstract: In a process and a device for adapting the position of printing plates (4) to the deformation (fan-out) of the paper web (2) to be printed through damp, ink absorption and mechanicl stress on passing between several successive pairs of pressure rollers (1) and also for adaptation to deformations possibly occurring in the fixing device of a pressure roller (1) and resultant changes in the position of a printing plate (4), the printing plate (4) or the support holding it in the stamping or bending machine (5) is moved or shifted laterally, peripherically and/or angularly by the amount required for said printing plate (4) on the pressure roller (1) as a function to said deformation of the paper web (2) to be printed, in order to obtain a corresponding pressure with a pressure roller (1) upstream of the paper web to be printed despite the paper deformation that has meanwhile occurred. Thereafter the deformations, i.e. bends and/or stamping (7) are applied to said printing plate (4) moved from its zero position. For this purpose in particular a computer-controlled positioning device (17) is used in the printing and/or stamping machine (5) after the corresponding data on the paper web, the printing machine and the type of production have been fed into the computer.

Strapping tool with improved punches

Abstract: An improvement in a punch design for a punch used within a strapping tool which creates seal-less connections between overlapping steel strap segments that are to be bound together. The punch is relieved along the edge surfaces that experience extreme forces during the stamping operation which physically binds the strap segments together. The relieved edges also provide a less acute angle for the stamped edge surfaces to scrape against once the tension on the straps is released.

Finite element modelling of the stamping of anisotropic sheet metals

Abstract: Addresses the computational aspects involved in the numerical simulation of sheet stamping processes. Focuses on some numerical aspects of the intrinsic complexity of these problems, the first of which is the necessity to take into account properly membrane and bending effects. Presents a well‐adapted shell element. The second aspect concerns the description and the implementation of the initial orthotropic plastic behaviour for sheet metal parts, based on a formulation in a rotating frame using the initial microstructure rotation. The stress calculation algorithm is based on a particular implementation of the elastic predictor‐plastic corrector method. The last aspect concerns the solution procedures with a particular development concerning the treatment of the blankholder load as a constraint. A set of computational results validated with experiments prove the accuracy of the proposed approach in solving stamping problems.

Stamping self-adhesive labels from plastic strip

Abstract: Plastic strip (1) is fed on the surface of a separation strip (11) between a stamping roller (2) and a back-up roller (3) where labels are punched out without leaving a punching frame on the strip. As the strip leaves the rollers, the strip (4) is pealed off and fed downwardly between rollers (3,5). At the same time another strip (12) is fed into place so as to receive the stamped strip (1). This strip (12) then passes through rollers (6,7) where the label are adhered to it. Because the strip (12) moves at a greater speed than strip (4) the labels are separated.

Stamping device having skirt and spring combination

Abstract: A stamping device (10) which comprises a body (11) having an open bottom end (12), a stamping member (21) provided at the body bottom end (12), a skirt (14) supported at the body bottom end (12) around the stamping member (21) for movement between a lower position to protect the stamping member (21) and an upper position to expose the stamping member (21) for stamping operation, and a spring (15). The spring (15) forms a one-piece structure with the skirt (14) and is adapted to resiliently bias the skirt (14) into the lower position. The spring (15) comprises opposite sides (16) joining the skirt (14) and an upper side (17) extending across the opposite sides (16).

Stamping, printing and punching machine

Abstract: An embossing press has an upper section (3) supported by the side pillars (6) with a heated (7) tool-plate (4) for the sleeve blocks (8). A positioning mechanism (10) forming part of the head (5,9) comprises a sliding wedge (11) whose location is controlled by a servomotor (20) and screwed shaft (12) giving work-thickness adjustment in the direction (Y). The lower press section (19) is made up of a quadruple 3-link (17) system having a common rotary origin to provide a vertical reciprocating motion (H) to the table (13) carrying the work platen (14) and embossing surface (F). The pressure sensors (51 to 54) or (55 to 58) signal the controller (2) in response to a programme (30) selected by the input unit (40) to enable performance monitoring and in-process correction where required.