Abstract: An apparatus for forming a shadow mask from a mask blank includes a punch having a convex surface, a pad having a complementary concave surface, and upper and lower dies having openings therein for receiving the punch and the pad, respectively. Each die also has a complementary nonplanar surface adjacent the opening for clamping the mask blank. Each die surface has a surface contour that substantially matches the extended surface contour of the mask blank when the mask blank lies against the inner edge of the lower die surface, so that wrinkling does not occur when the mask blank is clamped between the upper and lower dies.

Abstract: A structural metal sheet employed as an outer sheet for a railway vehicle, for example, is generally pretensioned in order to prevent buckling. Hitherto, the pretensioning is effected by various methods after or during the assembly of a structure. According to the invention, the metal sheet itself is pretensioned by a plastic working for increasing the flexural rigidity thereof. Thus, there is no fear of buckling, and the workmanship is improved as compared with the prior art.

Abstract: With workpieces to be drawn, especially large-area body parts or sinks, the possibilities of tearing the walls, respectively, undulated surface structure exists within the area of the corner formation. The present invention is therefore predicated on the concept to match the support pressure to the shaping of the workpiece in the different abutment areas thereof. A number of pressure cylinders fixedly installed in the press table serve for that purpose, whose piston rods are adapted to be to displaced in the vertical direction by way of a pressure plate acting in unison on all piston rods. The piston rods acting on the other end of the support are lowerable under the ram movement against the controllable pressure differing in the pressure chambers by way of valves.

Abstract: Apparatus and process for cold drawing a disk into a cap for a paper core. The process comprises cold drawing a disk to form a cylindrical cup having a rim and a socket, removing the central portion of the cup leaving a flange, straightening the flange and trimming the rim. The resultant cap is characterized by having a uniform-sized rim of a width equal to the width of the socket.The apparatus comprises a press having a fixed portion and a movable portion, a cylindrical member mounted on the fixed portion, a ram and a number of opposed cylinders carried by the movable portion, and means for moving the movable portion toward the fixed portion.

Abstract: A method and apparatus for forming end panels of uniform thickness for use with two-piece containers. The method includes the steps of engaging the stock under fluid pressure and blanking it; wiping the periphery of the stock against the blanking die to form a lip extending in a direction substantially normal to the planar surface of the blank. While still maintaining pressure on the blank, further steps involve drawing the blank to form an edge area that extends above the top planar surface of the blank and has a cross-sectional configuration resembling an inverted letter J, and finally completing forming of the end panel by reverse drawing the central body portion of the blank in an upward direction to set a chuckwall between the central body portion and the edge area. The apparatus includes tooling for a double action shell press which is capable of engaging and holding down the work piece under fluid pressure while performing the blanking and drawing operations.

Abstract: Method and apparatus for forming or reforming the shell of a two-piece container includes forming a cup shaped member in an upside down condition, reverse drawing the shell to form an over length chuckwall loosely holding the shell while pulling the excess material from the chuckwall into the bottom panel of the shell. The apparatus comprises tooling incorporated into a double acting press and including a punch core carried by the inner ram and an opposed die core carried by the bottom platen, a first pressure member carried by the outer ram and a die core ring fluidly supported on the bottom platen opposed to the pressure member and a punch shell carried on the inner ram. A second fluid pressure sleeve means is carried on the bottom platen in opposed relationship to the punch shell and a knockout piston is also carried by the lower platen opposed to the punch core and encircling the die core.

Abstract: A double acting press has a die carried by an upper slide thereby to be forced downwardly to engage a sheet metal blank between itself and a hollow blank holder, and a punch accommodated in the blank holder and thrusted upwardly by a lower slide for pressing the blank against the die. The blank to be formed must be placed horizontally on the fixed blank holder and the punch being held flush therewith in its lowermost position. In order to adjustably vary this lowermost position of the punch relative to the blank holder, a floating plate rigidly carrying the punch thereon is made to rest on a floating plate rest as the lower slide descends out of engagement with the floating plate. The floating plate rest is supported by upstanding worms in threaded engagement therewith. A bidirectional electric motor is coupled to the worms via shafting and gearing to cause joint rotation thereof in either direction and, in consequence, the upward or downward displacement of the floating plate rest.

Abstract: A method for deep-drawing sheet metal in a drawing apparatus having a drawing ring body, a pressure body, and a drawing plunger, which includes pushing a metal sheet having a deep-drawing region against the drawing ring body with the pressure body surrounding the deep-drawing region, pushing the drawing plunger against the deep drawing region, and heating the deep drawing region for deep-drawing, and an apparatus for carrying out the method.

Abstract: Modular male and female drawbead structures comprise wafers of varying thickness which abut each other and are longitudinally wholly or partially aligned relative to each other in respective slots of die binders. The male structure has a body portion including a base wall and side walls which match and are spaced from like walls of a respective slot. A bead portion projects from an outer wall of the body portion and is joined thereby across concave shoulders. The female structure has a body portion including a base wall seating on the matching base wall of a respective slot and side walls which match and are spaced from like walls of a respective slot. A groove portion in the outer wall of the female module interfits with the bead portion and is joined to such outer wall by convex shoulders which match the concave shoulders.

Abstract: A die assembly (2) which operates in a single stroke, both to draw and to trim a deformable sheet material such as sheet metal including relatively reciprocal upper and lower die sections (10,14) for draw forming a port and a trimming means (26), movable in a direction perpendicular to the relative reciprocal motion of the upper and lower die section (10,14), for cutting away a portion of the drawn material. The die assembly may include a fixed draw punch (18) over which the sheet material is drawn and a draw ring (52) shaped to complement the exterior shape of the draw punch (18) and to telescopically advance over the draw punch (18) during the drawing operation. At the end of the drawing operation, the draw ring (52) is positioned adjacent a trim punch (28) mounted on the lower die section (10).

Abstract: A deep-drawing and edge-trimming tool assembly for the shaping of workpieces with an upstanding peripheral edge flange and the subsequent trimming of the outer edge of the edge flange, the assembly comprising a vertically and horizontally movable bolster plate carrying a pressure ring and a drawing ring which cooperates with a stationary drawing punch arranged above the bolster plate, so that the drawing ring is movable downwardly, for a deep-drawing operation and, in its lowermost position, is also movable horizontally in four directions, for a sequential edge trimming operation, in cooperation with the lower peripheral edge of the stationary drawing punch.

Abstract: A press for manufacturing hollow articles by deep drawing comprising a high pressure vessel (1) accommodating a die (3) with a punch (4). A blank (14) is accommodated in an annular high pressure chamber (16) communicating with a high pressure chamber (19) of an intensifier (20). The press also comprises a device (27) for regulating pressure in the annular chamber to control pressure acting upon the peripheral portion of a blank in accordance with a preset law, an appliance (39) for setting pressure in the annular chamber is made in the form of a tracer whose profile is equidistant with the curve characterizing the alteration of pressure in the annular chamber (16).

Abstract: A stretch drawing apparatus comprising a constraining die having an inner die portion and an outer wall portion spaced apart from the die portion, a drawing punch positioned in conjunction with the die portion, a blank-holding block positioned in conjunction with the outer wall portion of the constraining die, the constraining die and each of the drawing punch and the blank-holding block being movable relative to each other in a predetermined direction so that the die portion and each of the drawing punch and the blank-holding block are movable toward and away from each other, and at least one wedge member having a blank-holding surface and movable in a direction perpendicular to the predetermined direction, wherein the wedge member engages the constraining die and the blank-holding block and has a thickness which increases away from the die portion toward the outer wall portion of the constraining die.

Abstract: In manufacture of a can body by drawing a cup from a blank and subsequently redrawing the cup, one or more redrawing steps are performed by pulling the sidewall of the cup (2) by means of a punch (12) through an S-shaped path (30,24,31), whereby the wall is bent first in one direction and then in the other, to reduce its diameter, which is then reduced further in a convergent portion (20) of the die (10). The bending induces back tensions which stretch the metal and reduce its wall thickness.

Abstract: An improved method and apparatus for deep drawing metal containers is disclosed in which flat sheet metal blanks are initially drawn into shallow cups having an open top, a substantially flat bottom wall, a substantially cylindrical sidewall and a curved transition section joining the bottom wall and sidewall. A redraw sleeve adapted to fit into and support the cups has a first annular clamping surface on its free end contoured and arranged to engage the transition section and the adjacent annular peripheral portion of the bottom wall of a cup. An annular redraw die is supported for movement from a retracted position spaced from the redraw sleeve to a clamping position cooperating with the redraw sleeve to clamp and hold the cups during redrawing. The redraw die has a second clamping surface contoured to engage the outer surface of the transition section and the adjacent annular peripheral portion of the bottom wall of a cup supported on the redraw sleeve.

Abstract: The invention concerns a process and device for the manufacture of blisters with high barrier properties using metal-plastic composite foils which can be deep drawn, in particular an aluminum-plastic composite foil which is clamped firmly in the clamping facility of a device for manufacturing blisters. The process is such that the composite foil is pre-stretched in a first step and then shaped into a blister in a second step.

Abstract: The invention relates to a method for drawing a wrinkle-free thin-walled cup from a sheet blank, using a die formed as a draw ring, a holddown that holds the blank material against the draw ring, and a drawing punch, which pushes the blank into the opening of the draw ring, wherein the blank material that flows from the slot between the draw ring and the holddown is formed by drawing in an initial zone of deformation which surrounds the punch, and flows into the opening of the draw ring over the latter's inner edge which is adjacent to the area of the holddown.According to the invention, in order to draw a conical cup of sheet metal, preferably of sheet steel, having a peripheral wall which forms with respect to the center axis of the cup an angle sheet is smaller than 60.degree. and preferably an angle of 3.degree.

Abstract: A sheet metal tool as two relatively movable tool sections, one of which is rovided adjacent its sheet metal-shaping face with a sheet metal holder which is movable relative to that face. Also movable relative to that face is a pressure-distributing unit composed of two spaced parallel plates which are maintained at a predetermined distance by spacers, this unit serving as an abutment for the sheet metal holder.

Abstract: A method for the high reduction of metal during a forming operation includes placing the metal blank being formed under compression by applying pressure to its peripheral edge surfaces and simultaneously engaging it with a drawing horn. The apparatus employed in the method includes a draw pad and a draw horn carried by the movable member or platen of a press and a die carried by the base of the press with the platen being movable toward and away from the base. The base also carries a matrix which carries a plurality of iris plates which are arranged in a circular fashion around a central axis of the die and which are adapted to move toward and away from the vertical center axis of the die so as to be moved into engagement with the peripheral edge surfaces of the blank as the press is brought to a closed position and the draw horn engages the blank.

Abstract: An apparatus for reverse redrawing of a cup is provided with an annular ring surrounding the upper end periphery of body portion of a die ring, provided concentrically with the die ring, a slightly larger clearance than the wall thickness of the cup to be redrawn being provided between the inside surface of the annular ring and the outside surface of the die ring.

Abstract: A method and apparatus are disclosed for forming a drawn container pan having planar side walls and smooth curved corner walls the upper edges of which are formed with an outwardly directed peripheral stacker ledge and an upstanding rim, and wherein the pan is formed by drawing the peripheral edge of a blank between clamping surfaces under selected pressure differential at the portions of the blank forming the side and corner walls of the pan. A method and apparatus are also disclosed for trimming the drawn pan and forming stacking protuberances adjacent the corners of the pan.

Abstract: The invention concerns a process and a device for manufacturing blisters with high barrier properties from a metal-plastic composite foil which can be deep drawn, in particular from an aluminum-plastic composite foil which is held fast in the clamping facility of a device for manufacturing blisters. In shaping the foil into one or more blisters, pressure is applied pneumatically or pneumatically and hydraulically to at least one side of the foil which stretches onto and over a lubricating layer or easy slip plate on the base of a die.

Abstract: A draw bead made integral with the die plate or as an insert and having alternating pressure applying surfaces and grooves which will thicken the metals drawn across it minutely at the grooves and will distribute the metal evenly at the pressure surfaces. The draw bead is preferably placed close to the draw radius of the die cavity, and it can have various shapes to compliment the shape of the die cavity. Substantially less blank holder pressure is required because the draw bead restrains the flow of metal and better distributes the metal as it is drawn into the die cavity, and since the draw bead is close to the draw radius, a smaller blank holder is possible. The draw bead can be used to form a portion of the drawn part thereby eliminating a secondary forming operation if the part requires a flat flange about its trim line.

Abstract: This invention provides for stamping of the platforms of a ball retainer on one side of the surface of the metal band and of the spherical seats on the other side of the surface of the band in a single continuous operation or in several operations. Two mating punches are used in order to stamp out the desired ball retainer. A first punch has rectangular upwardly projecting lugs and spherical recesses and the second punch has spherical outwardly extending lugs and rectangular recesses. As these two punches are moved toward each other, they cause the platforms and the spherical seats of the ball retainer to be stamped in the metal band. The lugs on each of the punches and the side surfaces of hollow recesses of the dies are provided with cutting edges, which cut out the ball retainer from the metal band.

Abstract: A method and apparatus are disclosed for forming a drawn container pan having planar side walls and smooth curved corner walls the upper edges of which are formed with an outwardly directed peripheral stacker ledge and an upstanding rim, and wherein the pan is formed by drawing the peripheral edge of a blank between clamping surfaces under selected pressure differential at the portions of the blank forming the side and corner walls of the pan. A method and apparatus are also disclosed for trimming the drawn pan and forming stacking protuberances adjacent the corners of the pan.

Abstract: Apparatus for drawing, or blanking and drawing, a flat metallic piece into a cup shape. A blanking punch, blanking die, draw die, movable stripper and a spacer are mounted on the stationary bed of a press. A pressure pad and draw punch are carried by the ram of a press. The pressure pad is positioned to contact first the blanking punch, then to contact the movable stripper and push it solidly against the spacer. As the ram continues its downward movement, the pressure pad collapses with respect to the ram by virtue of its connection to a piston operating in a cylinder in the ram containing controllable air pressure. The maintenance of a predetermined pressure pad-draw die gap during the draw prevents wrinkling, and the maintenance of the controlled pressure on the pressure pad prevents thinning and subsequent clipping of ears.

Abstract: The sheet metal draw die apparatus disclosed is used with a double-acting press for drawing a planar metal sheet to a predetermined nonplanar drawn article. Both the lower and upper dies consist of spaced-apart modules having only male work contact surfaces formed thereon such that the juxtaposition of the upwardly and downwardly facing male work contact surfaces constitute a distinct, continuous surface defining the drawn article.

Abstract: A method of drape drawing a shadow mask from a foraminous, or apertured, metal sheet that has a greater tensile in one direction than another and has edges extending in the one direction. During the drape procedure, the edges of the sheet that extend substantially in the direction in which the sheet has the greater tensile strength are allowed to slip relative to the draw ring and the pressure. As a result of this, the sheet is prevented from tearing.

Abstract: Single-slide press with single work-input stroke and other characteristics and advantages of single-action press carries out multiple functions of double or triple-action presses in the manufacture of cup-shaped articles. A blank is cut from flat rolled sheet metal and clamped while being drawn into a cup shape; the drum cup can be redrawn into a cup of smaller diameter and greater sidewall height. Work-input force applied to the work product is modified as required for each step with fluid controlled cylinder and piston means mounted to permit relative movement of portions of the single slide means for carrying out the individual steps in sequence.

Abstract: A means of and method of forming sheet metal by use of fluid pressure wherein an initially flat sheet metal work piece is placed on a backing plate with its margins clamped between the plate and a peripheral clamping ring. The clamping ring is clamped against the margin of the work piece by a plurality of fluid operated clamping units. the side of the work piece opposite from the backing plate and within the clamping ring is free to expand or distend without restraint except that provided by the metal comprising the work piece itself. Pressure fluid is introduced between the metal work piece and its backing plate to cause the work piece to distend away from the backing plate. A set of freely movable feeler strips engage the edge of the work piece at spaced points. The feeler strips control sensing units which, in turn, control the pressure exerted by the clamping units so as to permit predetermined slippage of the margin of the work piece with respect to the clamping rings.