Abstract: An energy-dissipating cover for covering a component sensitive to mechanical impulse includes a sheet of selected ferrous or aluminum alloy, the sheet having a top surface, a bottom surface, an outer perimeter, an overall area within the outer perimeter and a nominal thickness of no more than 2.5 mm. The sheet is configured for connection with one or more external structures at a plurality of connection points within the outer perimeter, wherein the overall area comprises a plurality of supported areas and at least one unsupported area. Embossments are formed within the at least one unsupported area and extend outward from the bottom surface. The embossments are shaped, sized and arranged so as to limit orthogonal deflection of the sheet from a mechanical impulse directed normal to the bottom surface of the sheet at the plurality of embossments.

Abstract: The present invention discloses a preparation method for a metal material, including: horizontally placing a to-be-prepared metal material between wavy surfaces of a female die and a male die; connecting a press machine with the male die; pressing the metal material through the male die, so that the metal material makes complete contact with the male die and the female die; ejecting the pressed metal material; horizontally overturning the metal material, and then placing the metal material between the wavy surfaces of the female die and the male die; repeatedly performing the pressing and overturning processes until accumulated strain of the metal material meets a requirement; and taking out the metal material after the deformed metal material is flattened by a plane die. According to the present invention, a large-size nano grained material can be manufactured.

Abstract: A connection arrangement has a crimp connector and a wire fixed in place in it, the crimp connector having a first and a second clamping plate, both single pieces, which in an assembled state clamp the wire between them and fix the wire in place with a tensile strength force acting in a longitudinally axial direction. Inner surfaces of the first and second clamping plate face one another at least in the assembled state are executed in a first form in the preassembled state. The first and second clamping plate fit tightly with one another and are deformed in the assembled state with a tool into a second form differing from the first that the wire, due to the deformation of the first and second clamping plates, forms at least one wave. A related valve and a related method are also disclosed.

Abstract: The invention concerns a forming device intended to form a bend in a corrugation, the forming device comprising: a bottom frame (4) having a planar mounting surface (6) intended to receive a sheet metal plate having a corrugation projecting relative to a planar portion of the sheet metal plate, a projecting counter-form (5) arranged on the mounting surface and intended to be accommodated in the corrugation, the projecting counter-form having a stationary portion (7) and a movable portion (8) that is hinged, relative to the stationary portion, about an axis perpendicular to the mounting surface, a top frame (34) arranged above the bottom frame, a press configured to lower the top frame towards the bottom frame, and a hollow upper die carried by the top frame between the top frame (34) and the bottom frame (4), the hollow upper die (36, 37) being arranged above the movable portion of the projecting counter-form.

Abstract: The invention relates to a bending device for forming corrugations in a metal sheet including: a lower frame; an upper frame able to move vertically between a rest position and a bending position; at least two dies, carried by the lower frame; one being fixed with respect to the lower frame and the other mounted with the ability to slide; at least two punches carried by the upper frame; one being fixed and the other being mounted with the ability to slide on the upper frame; the bending device being designed so that, in operation, as the upper frame moves towards its bending position, the metal sheet transmits a pulling force to the sliding punch and to the sliding die which force moves them from a spaced-apart position toward a close-together position.

Abstract: A method of making battery plates for lead-acid batteries includes providing a strip of material comprising lead; and punching material out of the strip to form a grid comprising wires having a non-rectangular cross-sectional shape by utilizing a die set comprising a plurality of male die components and female die components, wherein each of the male die components comprises a first portion having a first cross-sectional shape and a second portion having a second-cross sectional shape. A single punch of the material creates a hole in the material and also forms the periphery of the hole.

Abstract: A fixed die and a punch, which moves toward and away from the die, are provided. A series of bulges is formed in sheet metal between depressions and projections of the die and projections and depressions of the punch. In forming, the punch moves toward the die such that the sheet metal is pressed between first convex sections and second and third convex sections of the die and the punch, and subsequently the sheet metal is pressed between fourth convex sections.

Abstract: In a corrugated plate manufacturing apparatus, each of a plurality of primary forming punches includes a plurality of primary pressable portions that are arranged one after another in a slider reciprocating direction and are pressable by a corresponding one of a plurality of primary sliders. When the primary sliders are sequentially moved toward one side in the slider reciprocating direction, each corresponding one of the primary sliders presses the primary pressable portions of the corresponding one of the primary forming punches to press the primary forming punch against a secondary die.

Abstract: A wrench assembly for turning a central portion of a turnbuckle. The wrench assembly includes first and second wrenches that are substantially identical. Slots in body portions of each of the wrenches define open ends that are oppositely disposed to one another when engaging the central portion of the turnbuckle. The wrenches may be detachably secured together around the central portion of the turnbuckle. At least two spokes extend outwardly from a periphery of each of the body portions of the wrenches that are utilized to impart rotational movement to the central portion of the turnbuckle. In at least one configuration, a distal end of an elongated member is used to push and pull on the spokes to impart the rotational movement.

Abstract: A method of forming a part that has areas of high strain and predicted areas of low strain from a blank and method of designing a die for forming such a part. Predicted areas of low strain are identified that are adjacent to predicted areas of high strain. A pre-forming die is designed to form the blank to provide a donor pocket in an intermediate part in a predicted low strain area that is adjacent to the predicted high strain area. The donor pocket of the intermediate part is drawn into the predicted high strain area while forming the intermediate part into the part.

Abstract: The invention relates to a method and an apparatus for preparing a mother plate of a permanent cathode to be used in a process for electrolytic recovery of metal such as metal electrorefining or metal electrowinning. The apparatus comprises a holder for releasably holding the permanent cathode, a measurer for measuring a shape of the mother plate to obtain measurement data, a calculating device functionally connected with the measurer and configured for calculating geometric deviation of the mother plate in comparison to a predefined reference shape by using the measurement data, and a presser functionally connected with the calculating device and configured for automatically locally pressing the mother plate in accordance with the calculated geometric deviation of the mother plate to plastically deform the mother plate.

Abstract: A floor support for a grain bin floor made from a sheet of galvanized steel having a top surface, a bottom surface and flat ends. The floor support has a plurality of flanges and notches disposed within the top surface and a plurality of openings disposed through the sheet of galvanized steel. Positioned between each opening is a first bend. Positioned on either side of selected first bends is a second bend thereby forming a z-shaped floor support.

Abstract: A corrugate fin manufacturing apparatus includes: a die; a machining punch inserted into a concave in the die to form a rib, wherein on entering the concave, the machining punch does not contact a part of a plate-like body that has not been machined into ribs or does not cause resistance to drawing in of the unmachined part during formation of a rib even when there is contact; a mounting portion provided on the die; and a flat punch provided upstream of the machining punch, wherein when a rib is being formed, the flat punch is positioned to not contact the unmachined part or shaped to not cause resistance to drawing in of the machined part even when there is contact, and wherein after formation of a rib, the flat punch presses down the unmachined part and flattens the unmachined part in combination with the mounting portion.

Abstract: A floor support for a grain bin floor made from a sheet of galvanized steel having a top surface, a bottom surface and flat ends. The floor support has a plurality of flanges and notches disposed within the top surface and a plurality of openings disposed through the sheet of galvanized steel. Positioned between each opening is a first bend. Positioned on either side of selected first bends is a second bend thereby forming a z-shaped floor support.

Abstract: The invention relates to a deep-drawing method and a corresponding deep-drawing device. The deep-drawing device has at least two projections (112) and at least two corresponding lamellar gaps (102) in a die (106), the width and positioning (Pi) of the lamellar gaps (102) being adjustable. Folding of a metal sheet (10) is brought about by closing the lamellar gaps (102). During the subsequent deep-drawing process, the projections (112) are lowered into corresponding recesses (103). Flat metal sheets (10) as well as previously corrugated metal sheets (10) can be folded and deep drawn by means of the deep-drawing device and the deep-drawing method.

Abstract: A keyboard cover fabrication method for making a keyboard cover by processing a metal sheet material into a shaped metal component having protrusions and then cutting off a top part of each protrusion of the shaped metal component.

Abstract: One example embodiment includes a method of preparing a metallic tape for use on a joint. The method includes providing a metallic tape. The metallic tape includes a metallic carrier material and an adhesive layer. The metallic tape also includes a backing, wherein the backing material is configured to protect the adhesive layer until use. The method also includes creating alternating ridges and troughs along the width of the metallic tape. The method further includes creating a fold line along the length of the metallic tape, wherein the fold line includes an area lacking the alternating ridges and troughs. The method additionally includes cutting the backing along the fold line, wherein cutting the backing includes at least partially cutting through the backing on the metallic tape.

Abstract: The present invention provides an apparatus for manufacturing a truss structure using multi-point pins, a method of manufacturing a truss structure using the apparatus, a truss core sandwich panel having the truss structure, and a method of manufacturing the truss core sandwich panel. The apparatus includes a metal plate, clamps, an upper die and a lower die. The clamps hold the metal plate. The upper die has upper multi-point pins which press the metal plate downwards. The lower die has lower multi-point pins which press the metal plate upwards. The metal plate has first and second points that respectively correspond to the upper and lower multi-point pins. The first points are extended downwards by the upper multi-point pins, and the second points are extended upwards by the lower multi-point pins. Thereby, many symmetrical sides are formed in the truss structure, thus increasing the stability of the truss structure.

Abstract: A sheet forming tool (1) for the manufacture of a corrugated sheet has a lower tool element (40) and an upper tool element (50), each of the upper tool element and the lower tool element having a front side (23, 33, 41) and a rear side (25, 35, 42). The lower tool element (40) comprises a first base element (2, 4, 6, 8) and a first finger element (3, 5, 7, 9) projecting from said first base element (2, 4, 6, 8). The first finger element (3, 5, 7, 9) forms a first ridge (22, 24, 26, 28) for forming a corrugation peak in the sheet. The upper tool element (50) comprises a second base element (12, 14) and a second finger element (13, 15) projecting from said second base element (12, 14), the second finger element (13, 15) forming a second ridge (32, 34) for forming a corrugation trough in said sheet.

Abstract: Multiple movable die portions (press punches) are respectively opposing to multiple fixed die portions (block members). Each of the press punches is sequentially pushed down with a predetermined time difference to the corresponding block member to continuously carry out press work to a material inserted into a press-work area between the press punches and the block members. A clearance is formed between a forward end of the press punch and a forward end of the block member at a position shortly before a press-work operating position in order to control a pulling force of the material, so that a shape distortion can be avoided.

Abstract: A process for producing a structure in a smooth sheet-metal strip includes multiple process steps. In a first step, a first section of a smooth sheet-metal strip is fed to a first tool and a second section of the sheet-metal strip is fed to a second tool in a direction of advance. Then the sheet-metal strip is stopped. A sheet-metal machining of the first section of the sheet-metal strip is carried out using the first tool. A sheet-metal machining of the second section of the sheet-metal strip is carried out using the second tool, with the first feeding step being carried out simultaneously. An apparatus is provided for producing a sheet-metal strip of such a complex structure, which produces the structure with a very high degree of accuracy even when the materials properties differ.

Abstract: A system and method for producing flat tubes is described and illustrated. The flat tubes can be produced from at least one strip of endless band material having at least one wall part and an inner part formed with corrugations on a roller train provided with roller pairs, with the strip running in a longitudinal direction through the rollers and being shaped. The inner part of the flat tube can be formed with corrugations placed between the shaped wall parts, after which the closure of the flat tube is carried out. Production of the flat tubes can include forming spaced apart band thinning lines running in the longitudinal direction of the strip, and forming corrugation peaks and corrugation troughs at the band thinning lines.

Abstract: An electric wire shaping apparatus includes a pair of male and female shaping dies and a pressing mechanism. Each of the male and female shaping dies has a shaping surface that includes a plurality of straight parts and a plurality of bent parts. The pressing mechanism moves one of the male and female shaping dies toward the other, thereby pressing a turn portion of an electric wire between the shaping surfaces of the male and female shaping dies in a width-wise direction of the turn portion. Furthermore, the male and female shaping dies are so configured that when they are located closest to each other, a gap W2 between a corresponding pair of the bent parts of the shaping surfaces of the male and female shaping dies is different in size from a gap W1 between a corresponding pair of the straight parts of the shaping surfaces.

Abstract: The corrugated fin production equipment is capable of easily separating a corrugated fin having high ribs from a die after forming the ribs. The corrugated fin production equipment comprises: a lower block; an upper block being moved to and away from the lower block; the die being provided to the lower block and having a concave section; a punch being inserted into the concave section so as to form the rib when the lower block and the upper block are closed; and a movable die constituting a part of the die including the concave section, the movable die being upwardly moved above other parts of the die so as to lift a part of the corrugated fin, in which the rib has been formed, from the underside after the lower die and the upper die are closed to form the corrugated fin.

Abstract: A method and apparatus are used to form a corrugated web having a cross sectional shape with at least one characteristic that varies substantially continuously along the substantially the entire length of the web. The apparatus includes multiple sets of dies which progressively form corrugations in a moving sheet. At least one characteristic of the web's cross sectional shape is varied along the entire length of the web by displacing the dies as the sheet moves through the die sets.

Abstract: A bending method for forming, in a material in which several straight portions extending in parallel with each other and a first-end side coupling portion and a second-end side coupling portion provided alternately to couple first-end portions and second-end portions, respectively, of adjacent ones of the straight portions with each other are successively formed, folded portions respectively in a pair of the straight portions provided on both sides of the first-end side coupling portion. A length from one of the folded portions to the first-end side coupling portion is different from a length from the other of the folded portions.

Abstract: The present invention provides an apparatus for manufacturing a truss structure using multi-point pins, a method of manufacturing a truss structure using the apparatus, a truss core sandwich panel having the truss structure, and a method of manufacturing the truss core sandwich panel. The apparatus includes a metal plate, clamps, an upper die and a lower die. The clamps hold the metal plate. The upper die has upper multi-point pins which press the metal plate downwards. The lower die has lower multi-point pins which press the metal plate upwards. The metal plate has first and second points that respectively correspond to the upper and lower multi-point pins. The first points are extended downwards by the upper multi-point pins, and the second points are extended upwards by the lower multi-point pins. Thereby, many symmetrical sides are formed in the truss structure, thus increasing the stability of the truss structure.

Abstract: Disclosed is a method of forming a heat exchanger turbulizer apparatus including a member having a longitudinal axis, a lateral width and a plurality of strips including first strips and second strips, each strip extending widthwise and being corrugated longitudinally so as to form a plurality of laterally spaced-apart sections connected to one another by bridges projecting from the sections in a common direction, the bridges of the first and second strips extending in the same direction and the corrugations of the second strips being offset laterally from the corrugations of the first strips. The method comprises: crimping longitudinally-corrugated strip material between first and second forming dies to form said apparatus, said dies being adapted such that substantially all lateral movement of strip material in crimping results from strip material being drawn laterally by material that has been displaced in a direction parallel to the direction of die movement.

Abstract: An apparatus and method for forming at least one end turn and at least one stator slot segment of a conductor for a stator of a dynamoelectric machine comprising at least two forming die sets. The forming die sets are disposed having a space substantially equal to a width of the conductor between adjacent die sets and include a female forming die and a male forming die linearly slideable to the female forming die. The die sets are disposed such that both at least one end turn and at least one stator slot segment are formable between the male forming dies and the female forming dies when the male forming dies are sequentially actuated to the female forming dies.

Abstract: According to this method, a strip is folded and stamped in successive steps by means of two opposing blocks that move alternately toward and away from each other, these blocks having textured active surfaces that are not conjugate with the two surfaces of the corrugation, and the surface of the strip is textured before the folding and stamping are carried out. The invention can be used for air distillation columns.

Abstract: A method and apparatus is disclosed for manufacturing sinuous springs wherein each spring comprises a discrete length of sinuous spring wire having parallel straight bar segments interconnected at their opposite ends by oppositely directed curved connecting segments. This apparatus is operable to adjust the length of the sinuous spring wires exiting the machine without turning off or stopping the machine. An operator need only rotate a handle outside a housing of the machine to increase or decrease the length of the sinuous spring wires exiting the machine.

Abstract: An adjustable die set and method for forming corrugations in a sheet in which pairs of elongated forming bars are detachably mounted parallel to each other in respective holders driven by upper and lower press members. One pair is more closely spaced than the other and moves between the forming bars of the other pair to form a corrugation. The spacing and depth of the bar is varied to produce corresponding varying configurations of the corrugations.

Abstract: A finished product receiving rack used in a corrugated metal sheet member fabrication system for receiving finished products in which two guardrails with protective members are arranged in parallel along the length of the rack body to guide delivering finished products in course and to prevent accidental injury to workers, and steering gears and guide screws are arranged on the rack body and rotatable by motors to move the guardrails and to further adjust the gap between the guardrails subject to the size of the finished products to be carried.

Abstract: A press for crimping longitudinal edges of a plate for the manufacture of pipe has a closed press frame, an upper press platen, and a lower press platen extending longitudinally through the frame. A pair of transversely spaced and transversely shiftable upper supports are provided on the upper platen, and a pair of transversely spaced and transversely shiftable lower supports on the lower platen. Respective upper dies are fixed in the upper supports and have downwardly directed lower faces, and respective lower dies are fixed in the lower supports and have upwardly directed upper faces. A piston/cylinder assembly braced between the frame and one of the platens and pressurizable to shift the one platen vertically toward the other of the platens. Hydraulic actuators may position the holders and their dies transversely and also lock them in place.

Abstract: Arrangements including pressing arrangements of dies are provided as well as processes for pressing a contour into tubular material. Handrails and docks having a handrail thereon are provided. Processes for disembarking/embarking between a floating vessel and a dock are provided.

Abstract: Disclosed is a curved surface forming method for a metal plate. Nonlinear finite element analysis of elasto-plastic large deformation is performed on the metal plate. The metal plate to be worked is formed so as to have a three-dimensional target curved surface on the basis of the analysis results using a plurality of forming punches connected to a hydraulic apparatus. The curved surface formation method is very useful when the metal plate is worked for small quantity batch production.

Abstract: Expanded metal machine includes a fixed blade, a displaceable blade, displaceable in a vertical and a transverse direction and which has a cutting edge with cutting projections interspaced in the transverse direction. Conveying device for conveying a flat material in a direction of conveyance between the blades. Ram for effecting a periodic vertical movement of displaceable blade, and a transverse displacing device for effecting a transverse displacement of displaceable blade that is synchronized with reciprocating motion. To enable a precise fine adjustment of the cutting gap, fixed blade is held in a fixed one-piece or multiple piece blade holding fixture vertically adjustable by a depth of cut adjusting device for adjusting a vertical depth of cut between the blades. Depth of cut adjusting device has at least two oppositely tapering wedges, displaceable in a coupled manner and having parallel sloped surfaces held in blade holding fixture in a sliding manner.

Abstract: A process for producing a structure in a smooth sheet-metal strip includes multiple process steps. In a first step, a first section of a smooth sheet-metal strip is fed to a first tool and a second section of the sheet-metal strip is fed to a second tool in a direction of advance. Then the sheet-metal strip is stopped. A sheet-metal machining of the first section of the sheet-metal strip is carried out using the first tool. A sheet-metal machining of the second section of the sheet-metal strip is carried out using the second tool, with the first feeding step being carried out simultaneously. An apparatus is provided for producing a sheet-metal strip of such a complex structure, which produces the structure with a very high degree of accuracy even when the materials properties differ.

Abstract: Disclosed is an apparatus for forming a wire to include coil segments useable in a dynamoelectric machine, the apparatus including a plurality of forming structures simultaneously moveable along an axis into a coil segment forming configuration, with at least a number of the plurality of forming structures being configured to hold a wire, and at least one actuating device associated with at least a number of the plurality of forming structures and configured to simultaneously move the number of the plurality of forming structures into the coil segment forming configuration.

Abstract: The invention can be defined in its most general form as a device for sheet material corrugation by means of bending and can be used in production of light core for sandwich panels, and elements of heat-exchange apparatus. The device includes the pivotedly connected in-between shaping and auxiliary systems of dies (4) and the drive for their transformation including the system of vacuumization and the chamber (3) made of flexible gas-proof material where the latter of said systems is fixed. Used to set the system of shaping dies (4) into its initial plane state is the mechanism made in the form of rigid chamber with the perforated cap (2) providing the possibility to connect the chamber to the system of vacuumization. The device also includes the subsidiary flexible removable vacuum chamber (8) wherein the blank (6) from sheet material is placed in contact with the shaping system of dies (4).

Abstract: The invention can be defined in its most general form as a device for sheet material corrugation by means of bending and can be applied in the devices for production of single curvature folded core used in production of aircraft and craft curvilinear panels. The invention has for its object to broaden the technological capabilities. For that the mandrel is made in the form of a set of alternating rows of plane elements (4, 6, 7) made in the form of trapeziums (4) and isosceles triangles (6, 7) fixed on the flexible material of the base (5) forming thus the gap-pivots between the elements. At the same time the bases of the triangular elements (6, 7) face each other in pairs along the bending lines while said bending lines correspond to the protrusions lines of the core folded structure. The base of the triangular elements (6, 7) is the function of the folded core block curvature radius and the geometrical parameters of the zigzag crimp structure.

Abstract: An upper mold member 32 having an upstream upper punch 32a, an upper recess portion 32b and a downstream upper punch 32c that are serially arranged, from a feed upstream side of a sheet material W and a lower mold member 24 having an upstream lower punch 24a, a lower recess portion 24b and a downstream lower punch 24c that are serially arranged from the feed upstream side of the sheet material W are caused to displace towards a feed downstream side of the sheet material W while the upper mold member 32 and the lower mold member 24 sandwich the sheet material W between them. The productivity of a press apparatus can be improved and the cost can be reduced.

Abstract: An adjustable die set and method for forming corrugations in a sheet in which pairs of elongated forming bars are detachably mounted parallel to each other in respective holders driven by upper and lower press members. One pair is more closely spaced than the other and moves between the forming bars of the other pair to form a corrugation. The spacing and depth of the bar is varied to produce corresponding varying configurations of the corrugations.

Abstract: A device and a process for producing a corrugated plate having a plurality of bent-into-contact portions extending in parallel on one face of a metal plate employs a number of steps. A first pressing step sequentially molds a plurality of U-shaped bent portions in the metal plate. A second pressing step sequentially molds the bent-into-contact portions by sequentially crushing the plurality of U-shaped bent portions. In the first pressing step, the U-shaped bent portions are fed in a direction orthogonal to the direction of the U-shaped bent portions, and positioned, and are pressed in a state in which the position is released. In the second pressing step, another face of the metal plate is pressed flat while molding the bent-into-contact portions by pressing the U-shaped bent portions from both sides.

Abstract: The equipment for producing a corrugate fin is capable of forming corrugated sections by one closing action. The equipment comprises: a plurality of punches respectively having projections, each of which is upwardly projected from an upper face of the punch and has a side slope face; a pair of cam blocks being capable of relatively moving close and away each other, the cam blocks respectively having pressing sections, which are capable of moving along the side slope faces and contacting the projections; and a cam plate relatively moving the cam blocks close or away each other. Positions of the side slope faces of the projections are different so as to make the pressing sections contact the projections in order, and the cam blocks move the punches toward the die in order by one closing action of the blocks.

Abstract: The configuration comprises a shaping member 3 having a substantially rectangular shape and shaping the inner surface side of a bent portion 1b, a worm gear 2 slidably linked with the shaping member 3 and gradually reducing the distance between the shaping members 3 for sequentially feeding the shaping member 3 from one side to the other side, and a reference member 4 arranged so that the upper end surface of the bent portion 1b comes into contact with its reference surface, and the distance between the shaping members 3 is gradually reduced to a predetermined fin pitch and the upper end surface of the bent portion 1b is shaped into a predetermined shape by rotating the worm gear 2 after the plurality of bent portions 1b are arranged at the shaping members 3. Due to this, it is possible to shape the bent portion into a continuous and stable shape.

Abstract: A bending machine according to the present invention include: a first fixture member 22 for holding one end portion of a long work 20; a second fixture member 24 for holding the other end portion of the work 20; a rack 30 mounted on the first fixture member 22 so as to extend in longitudinal directions of the first fixture member 22; a roll-shaped bending die 21, mounted on the second fixture member 24, for bending the work along the outer peripheral surface of the second fixture member; a pinion gear 26 which is coaxially connected to the bending die 21 via a shaft 28 and which engages the rack 30; and a connecting member 27 for connecting the first fixture member 22 to the second fixture member 24 via the shaft 28 in a relatively rotatable state so that the pinion gear 26 is movable along the rack 30 while engaging the rack 30.

Abstract: The invention relates to a process and an apparatus for producing a profiled sheet, in which the sheet is provided with a corrugation which runs obliquely with respect to the edges of the sheet and has a substantially constant angle of inclination. At least one edge region of the sheet is deformed by means of a ram-like deformation tool (6) which is alternately brought into contact with the edge region and removed from the edge region.

Abstract: A press forming apparatus, for metal separators for fuel cells, has a pair of peripheral portion holding dies which hold a peripheral portion of a material and are movable toward and counter to each other; a pair of intermediate portion forming dies for forming a intermediate portion of the material, which are disposed inside the peripheral portion holding dies and are movable toward and counter to each other; and a pair of center portion forming dies for forming a center portion of the material, which are disposed inside the intermediate portion forming dies and are movable toward and counter to each other, wherein one of the peripheral portion holding dies and one of the intermediate portion forming dies are fixed to each other, one of the center portion forming dies is movable with respect to one of the intermediate portion forming dies toward the material, the other intermediate portion forming die and the other center portion forming die are fixed to each other, and the other intermediate portion forming

Abstract: A pressing apparatus includes a lower die (24) fixed to a lower plate (11), and first and second plate (11), and first and second upper die punches (33 and 34) capable of being lifted and lowered along with an upper plate (12). The first upper die punch (33) supported by a spring (49) is capable of being lifted and lowered relative to the second upper die punch (34). The upper plate (12) is lifted and lowered, while intermittently feeding a band-shaped work (W) one pitch by one pitch from the right to the left along an upper surface of the lower die (24), thereby pressing the work (W) to form grooves in the work (W) continuously. When the groove is formed in the work (W) by pressing the work (W) by the second upper die punch (34), the groove formed at the last time by pressing the work (W) by the second upper die punch (34) is retained and positioned between the first upper die punch (33) and the lower die (24).