A fin manufacturing method and apparatus includes: a first inter-row slit device that forms, by forming in a thin metal plate having a plurality of openings a plurality of slits extending in a longitudinal direction of the thin metal plate while leaving an uncut portion between the plurality of slits, metal strips partially coupled to each other in a transverse direction; a feed roller and a feeding device that convey, in the longitudinal direction, the metal strips in which the plurality of slits is formed by the first inter-row slit device; and a stacking device that (i) forms fins by cutting the uncut portion via which the metal strips are coupled to each other, to separate the metal strips and by cutting the metal strips at regular length intervals and (ii) stacks the formed fins.

A drive unit (4) of the belt (3) for a molding machine (1) of bored fins comprises a fixed front part (12) and a movable rear part (13) driven longitudinally with a forward and backward movement to and from the fixed front part (12). Both parts (12, 13) of the drive unit (4) include support plates (16, 31) on the upper surfaces thereof for vertical teeth (20, 35) with oblique top (22, 37) which protrude upwards under elastic thrust (24, 39) and are suitable for being inserted into corresponding bored collars (52) of the belt (3) downstream of a boring unit (2). The upper surfaces of each of the two parts (12, 13) of the drive unit (4) support at least a further support plate (17, 32) for vertical teeth (21, 36) of greater diameter, which is liftable and lowerable by a control panel (50).

A method of manufacturing a stacked core includes forming a first pilot hole in a metal plate, forming a worked portion of the metal plate in a state in which a first pilot pin is inserted into the first pilot hole, the worked portion being displaced relative to a plane of the metal plate, press-fitting the worked portion of the metal plate to reposition the worked portion to extend along the plane of the metal plate, forming a second pilot hole in the metal plate after press-fitting the worked portion of the metal plate, and forming a blanked member by blanking the metal plate in a state in which a second pilot pin is inserted into the second pilot hole, the blanked member including the worked portion.

A method for feeding a material strip to the processing zone of a punch press, wherein the material strip is clamped between a pair of feed rollers and is fed intermittently by rotating the feed rollers at intervals, and wherein the following steps are carried out after each feed of the material strip and before the next feed of the material strip in a feed pause with the material strip stationary and clamped between the feed rollers: holding the material strip by fixing the feed rollers with a certain holding torque; temporarily reducing or eliminating the holding torque of the feed rolls; positioning the strip of material with the holding torque of the feed rollers reduced or removed by inserting one or more pilot pins into associated pilot holes in the strip of material, the strip of material being displaced by the pilot pin or pins and the feed rollers being rotated by the strip of material clamped between them as it is displaced, optionally overcoming the reduced holding torque; and re-extending the pilot pin(s) from the pilot holes of the material belt. This method makes it possible to achieve a highly precise strip feed even without complex intermediate lifting mechanisms.

A fin manufacturing apparatus includes: a progressive pressing device that forms, by forming in a metal plate having thermal conductivity a plurality of openings for tube-insertion and a plurality of slits while leaving uncut portions, strips that each have openings along a longitudinal direction of the strip and are partially coupled to each other in a width direction; an inter-row cutting device that separates, by cutting the portions via which the strips are coupled to each other, the strips such that each strip has a width of the fin; a cutoff device that cuts the separated strips to a predetermined length; and a guiding device between the inter-row cutting device and an inter-row slit device that guides and supplies, to the inter-row cutting device, the strips that are partially coupled to each other in the width direction, are arranged in the width direction, and are conveyed in the longitudinal direction.

Conveying of a molded body for heat exchanger fins at a high speed to prevents deformation of the molded body for heat exchanger fins and the generation of noise. A molding apparatus forms a plurality of cutaway portions at different positions on each molded body of the product width. A rotational shaft is provided that extends in the width direction and has a plurality of rotating discs that have a plurality of tapered protrusions, which are capable of advancing into the cutaway portions, formed on an outer circumferential surface thereof provided on the rotational shaft for each molded body for heat exchanger fins of the product width. When the plurality of cutaway portions of the molded bodies for heat exchanger fins of the product width, on which the plurality of cutaway portions has different positions, are disposed directly above the rotational shaft, the protrusions advance into the cutaway portions.

Conveying of a molded body for heat exchanger fins at a high speed to prevents deformation of the molded body for heat exchanger fins and the generation of noise. A molding apparatus forms a plurality of cutaway portions at different positions on each molded body of the product width. A rotational shaft is provided that extends in the width direction and has a plurality of rotating discs that have a plurality of tapered protrusions, which are capable of advancing into the cutaway portions, formed on an outer circumferential surface thereof provided on the rotational shaft for each molded body for heat exchanger fins of the product width. When the plurality of cutaway portions of the molded bodies for heat exchanger fins of the product width, on which the plurality of cutaway portions has different positions, are disposed directly above the rotational shaft, the protrusions advance into the cutaway portions.

A fin manufacturing apparatus includes: a first inter-row slit device that forms, by forming in a thin metal plate having a plurality of openings a plurality of slits extending in a longitudinal direction of the thin metal plate while leaving an uncut portion between the plurality of slits, metal strips partially coupled to each other in a transverse direction; a feed roller and a feeding device that convey, in the longitudinal direction, the metal strips in which the plurality of slits is formed by the first inter-row slit device; and a stacking device that (i) forms fins by cutting the uncut portion via which the metal strips are coupled to each other, to separate the metal strips and by cutting the metal strips at regular length intervals and (ii) stacks the formed fins.

A drive unit (4) of the belt (3) for a molding machine (1) of bored fins comprises a fixed front part (12) and a movable rear part (13) driven longitudinally with a forward and backward movement to and from the fixed front part (12). Both parts (12, 13) of the drive unit (4) include support plates (16, 31) on the upper surfaces thereof for vertical teeth (20, 35) with oblique top (22, 37) which protrude upwards under elastic thrust (24, 39) and are suitable for being inserted into corresponding bored collars (52) of the belt (3) downstream of a boring unit (2). The upper surfaces of each of the two parts (12, 13) of the drive unit (4) support at least a further support plate (17, 32) for vertical teeth (21, 36) of greater diameter, which is liftable and lowerable by a control panel (50).

A fin manufacturing apparatus includes: a progressive pressing device that forms, by forming in a metal plate having thermal conductivity a plurality of openings for tube-insertion and a plurality of slits while leaving uncut portions, strips that each have openings along a longitudinal direction of the strip and are partially coupled to each other in a width direction; an inter-row cutting device that separates, by cutting the portions via which the strips are coupled to each other, the strips such that each strip has a width of the fin; a cutoff device that cuts the separated strips to a predetermined length; and a guiding device between the inter-row cutting device and an inter-row slit device that guides and supplies, to the inter-row cutting device, the strips that are partially coupled to each other in the width direction, are arranged in the width direction, and are conveyed in the longitudinal direction.