Abstract: A feeder apparatus for a metal strip includes: a reciprocating block reciprocally moved by a driving means of a press apparatus when conveying the metal strip in which through-holes are formed in a predetermined direction; a moving block disposed above the reciprocating block and connected to a connecting member that moves in the direction of movement of the reciprocating block; a pin block that moves with the moving block and is provided with conveying pins whose front ends are inserted inside the through-holes; and an upper-lower cam portion that raises and lowers the pin block. The moving block is not pulled by the reciprocating block, and the feeder apparatus further includes a moving block driving means for reciprocally moving the moving block separately to movement of the reciprocating block.

Abstract: A flattened tube fin manufacturing apparatus includes: a press apparatus; an inter-row slit apparatus forming metal strips of a product width that are arranged in the width direction; a first feeding apparatus feeding the metal strips cut by the inter-row slit apparatus downstream; a cutoff apparatus that cuts the metal strips formed by the inter-row slit apparatus into predetermined lengths to form flattened tube fins; and a second feeding apparatus that feeds the flattened tube fins downstream. The plurality of metal strips outputted from the inter-row slit apparatus advance into the cutoff apparatus after entering a downwardly sagging state. The flattened tube fin manufacturing apparatus further includes a control unit controlling a feeding amount of the second feeding apparatus based on a feeding amount of the first feeding apparatus.

Abstract: A stacking apparatus capable of stacking flattened tube fins efficiently is provided. There is provided a stacking apparatus for stacking flattened tube fins, each having a cutaway portion through which a heat exchanger flattened tube is inserted, formed from one side to the other side in a width direction, the stacking apparatus including a stack pin to be inserted into the cutaway portion, and the stack pin has a swing-preventing structure.

Abstract: A manufacturing apparatus that manufactures flattened tube fins includes: a press apparatus equipped with a mold apparatus that forms cutaway portions in a thin metal plate to produce a metal strip; an inter-row slit apparatus cutting the metal strip into predetermined widths to form metal strips of a product width; a cutoff apparatus that cuts the metal strips of the product width into predetermined lengths to obtain flattened tube fins; and a metal strip guide which is disposed between the inter-row slit apparatus and the cutoff apparatus and supplies the metal strips of the product width to the cutoff apparatus in a state where the metal strips are separated from one another.

Abstract: A flattened tube fin manufacturing apparatus includes a press apparatus equipped with a mold apparatus forming cutaway portions into which flattened tubes are inserted to produce metal strips; an inter-row slit apparatus cutting the metal strip, in which the cutaway portions have been formed, into predetermined widths to form a plurality of metal strips of a product width arranged in the width direction; and a cutoff apparatus cutting each metal strip of the product width formed by the inter-row slit apparatus into predetermined lengths. The metal strips of the product width outputted from the inter-row slit apparatus advance into the cutoff apparatus after entering a downwardly sagging state. A support portion that contacts and supports lower surfaces of the metal strips of product width in the downwardly sagging state is also provided.

Abstract: The present invention solves a problem with conventional tube expanding method for heat exchanger tubes that is susceptible, when carrying out tube expansion on U-shaped heat exchanger tubes that have a narrower diameter than in the past and forming flare portions in opening portions that have been subjected to tube expansion, to a buckling phenomenon at boundaries between straight portions and hairpin portions of the heat exchanger tubes or a vicinity thereof. Opening portions of U-shaped heat exchanger tubes 56 that pass through a fin layer 54 protrude from an upper end surface of the fin layer 54, hairpin portions 56b of the heat exchanger tubes 56 protrude from a lower end surface of the fin layer 54, and tube expanding billets 22 are inserted into each opening portion of the heat exchanger tubes 56 to carry out primary tube expansion that expands the diameter of each straight tube portion 56a of the heat exchanger tubes 56 to integrate the heat exchanger tubes 56 and fins 50.

Abstract: A manufacturing apparatus that manufactures flattened tube fins, in which cutaway portions for inserting flattened tubes for heat exchanging are formed, includes: a press apparatus provided with a mold apparatus that forms the cutaway portions in an unmachined metal thin plate to produce a metal strip; an inter-row slit apparatus cutting the metal strip into predetermined widths to form a plurality of metal strips of a product width; a cutoff apparatus cutting each metal strip of the product width into predetermined lengths; a holding apparatus that holds a plurality of metal strips of the product width that protrude from a downstream side in the conveying direction of the cutoff apparatus; and a stacker apparatus for stacking the flattened tube fins that have been cut into predetermined lengths by the cutoff apparatus.

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: In a state where the expanded protruding portion of the heat-exchanging tube, which has been expanded inside a grip portion of a chucking sleeve whose diameter has been reduced by a clamp bushing, is gripped by the grip portion, a tube expanding billet is inserted into a yet-unexpanded part of the heat-exchanging tube to cause tube expansion. When doing so, a guide portion, which is formed on a flare punch and has the same diameter as the maximum outer diameter of the tube expanding billet, is inserted inside the expanded protruding portion of the heat-exchanging tube gripped by the grip portion.

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 method of manufacturing a heat exchanging fin having an oval collared through-hole is capable of reducing manufacturing cost. The method comprises the steps of: forming a circular projected section, whose transverse sectional shape is a circular shape, in a thin metal plate; drawing the circular projected section a plurality of times so as to form into an oval projected section, whose transverse sectional shape is an oval shape and which has a prescribed height, a prescribed major axis and a prescribed minor axis; and boring a through-hole in the oval projected section so as to form the collared through-hole.

Abstract: A recess portion for setting an attachment position is formed in each plate fin at positions adjacent to both longitudinal ends of the plate fins on both upstream and downstream ends in an air flowing direction. Therefore, air passing through the plate fins is disturbed by a standing wall portion of the recess portion around the longitudinal ends of the plate fins. Thus, it can prevent a thermal boundary layer from being expanded in a heat exchanger having the plate fin, and heat-transmission efficiency can be improved in the heat exchanger. As a result, an entire area of the plate fin can be effectively used, thereby improving heat-exchanging capacity of the heat exchanger.

Abstract: The method of manufacturing a heat exchanging fin is able to restrict forming wrinkles and ring marks in the heat exchanging fin. The method comprises the steps of: forming dome sections having diameters greater than the diameters of collared-through-holes and which are projected from one side face of a thin plate, and a plurality of circular recesses having diameters greater than of the dome sections, each of which encloses one of the dome sections, the circular recesses being depressed toward the opposite face of the thin plate; forming the dome sections and the recesses into truncated cone-shaped sections in a plurality of steps; forming a through-hole in each of the truncated cone-shaped sections; forming edges of the through-holes into collars; and forming a flange at a front end of each of the collars.

Abstract: In the method of manufacturing a heat exchanger, transverse sectional shapes of heat exchanging tubes can be easily formed into elliptical shapes. The method includes the steps of: piling metallic fins, each of which includes collared through-holes, so as to form tube holes, which are formed by connecting the collared through-holes; piercing heat exchanging tubes, whose transverse sectional shapes are circular shapes, through the tube holes; and inserting expanding bullets, whose transverse sectional shapes are elliptical shapes, into the heat exchanging tubes. The heat exchanging tubes are elliptically expanded to and integrated with the metallic fins.

Abstract: A tube expanding bullet is inserted into and expands a heat exchanger tube which has been pierced through collared fin holes of piled heat exchanging fins, so as to expand the fin holes and integrate the tube with the heat exchanging fins. The tube expanding bullet has a first part formed at a front part of the tube expanding bullet and a second part formed at a rear part of the tube expanding bullet whose maximum outer diameter is greater than that of the first part. The fin holes are firstly expanded by passing the first part of the bullet through the tube. The fin hole is secondly expanded by passing the second part of the bullet through the tube. A first rate of expansion of the fin hole by the first part of the tube expanding bullet is less than a second rate of expansion of the fin hole by the second part of the bullet.

Abstract: To provide a heat exchanging fin capable of preventing cracks from forming in the flares of the collared tube holes, even if the metallic plate section is made of thin and tough material. In the heat exchanging fin, a metallic plate section has a plurality of tube holes. A plurality of collars are respectively extended from edges of the tube holes. A plurality of flares are respectively formed at front ends of the collars. Each flare includes a plurality of radially extended sections, which are radially outwardly extended from the front end of each collar. Furthermore, separation between the metallic plate section and each radially extended section is fixed.

Abstract: An object of the present invention is to provide a very thin heat exchanging fin, having collars with tough flanges that are not deformed when the heat exchanging tubes are integrated therewith. The heat exchanging fin includes: a plate section having a plurality of through-holes through which a heat exchanging tube will be pierced; and a plurality of collars having a prescribed height, each of the collars extending from an edge of each of the through-holes and having a flange at a front end, characterized in: that an inner face of each collar is formed perpendicular to the plate section; and that thickness of a base end part of each of the collars, which is connected to the plate section, is thicker than that of a middle part thereof. With this structure, the strength of the base end part of the collars can be greater even if the collars are made higher and thinner. The deformation of the collars can be prevented when the heat exchanging tubes are pierced and integrated with the collars.

Abstract: In forming a heat exchanger, a tube of the heat exchanger is expanded by a bullet, which is attached to a mandrel. The tube is projected from both end faces of a piled body formed by piling a plurality of fins. Each fin has a tube hole through which the tube passes. The fins and the tube are integrated by expansion of the tube. A first projected section of the tube, which is projected from one end face of the piled body and which has been expanded by the bullet, is held at a prescribed position. The bullet is pressed toward a second projected section, which is projected from the other end face of the piled body. As the bullet moves toward the second projected section, it expands the tube. The second projected section of the tube is allowed to contract during the tube expansion. An object of the present invention is to prevent adhesion of adjacent fins and irregularities in fin clearances between adjacent fins.

Abstract: The die set manufactures a heat exchanging fin by the steps of: forming a projected section in a thin metal plate; drawing the projected section, once or a plurality of times, to reduce the diameter thereof and to form the projected section into a cylindrical section; and piercing and barring the cylindrical section to form into a collar section through which a heat exchanging pipe is pierced. The die set comprises: a lower die; an upper die having a die hole whose diameter is shorter than the bottom diameter of the projected section not drawn; a punch being provided in the lower die; and a lifter being provided in the lower die, the lifter being biased toward the upper die by elastic means, the lifter having a through-hole through which the punch passes and an accommodating space for accommodating a slackened section of the projected section, which is formed in the vicinity of a base thereof while drawing the projected section.

Abstract: An object of the present invention is to provide a die set, which is capable of removing the influence of heat expansion and the change of the number of the collared holes and improving the accuracy of the collar height. In a die set including an upper die and a lower die wherein a metal plate having a collared hole is provided between the dies to form a flange section at an end of the collar, a flare-punch is provided to the upper die and is capable of vertically moving therein. The flare-punch has a flange forming section for forming the flange section. A biasing member biases the flare-punch toward the lower die. A level pin for defining a lower dead point of the flare-pin is provided to the lower die. The level pin is capable of coming into contact with the flare-punch, which has been in the collar, when the upper die and the lower die are closed.