Inter-row slit blade and inter-row slit forming device

Abstract

The utility model provides an inter-row slit cutter and an inter-row slit forming device. The cutting length can be determined regardless of the overlapping amount of an upper cutter and a lower cutter. An inter-row slit cutter (41) in which inter-row slits (90) extending in the direction of conveyance of a metal strip-shaped body are formed at predetermined width dimensions for the metal strip-shaped body (81) in which a plurality of heat exchange fins (88) are formed in the width direction, the inter-row slit cutter being characterized in that: the inter-row slit cutter has an upper cutter (42) and a lower cutter (46) arranged so as to face the metal strip-shaped body; the ends (42B, 46B) of the cutting edges (42A, 46A) of the upper blade and the lower blade on the inlet side in the conveying direction of the metal strip body are each in an arc shape, and the ends (42C, 46C) of the cutting edges of at least one of the upper blade and the lower blade on the outlet side in the conveying direction are in the following shape: no matter how the overlapping amount of the upper blade and the lower blade when the inter-row slit (90) is formed, no matter how the overlapping amount of the upper blade and the lower blade is, no matter how the inter-row slit (90) is formed, no matter the overlapping amount is, no matter the overlapping amount is, no matter the overlapping amount is, no matter the overlapping amount is, no matter the overlapping amount is. The positions of the forming ends of the inter-row slits on the outlet side in the conveying direction are all constant positions.

Description

Technical Field

[0001] The utility model relates to an inter-row slit knife and an inter-row slit forming device, and more particularly to an inter-row slit knife used when a plurality of heat exchange fins are divided into product widths when manufacturing heat exchange fins for a heat exchanger, and an inter-row slit forming device having the inter-row slit knife. Background Art

[0002] A device for manufacturing heat exchanger fins for heat exchangers includes an inter-row slit forming device that divides a metal strip having multiple heat exchange fins formed thereon into heat exchange fins of product width. The inter-row slit blade used in this inter-row slit forming device includes a structure disclosed, for example, in Patent Document 1 (Japanese Patent No. 5915640). Specifically, the inter-row slit blade comprises an upper blade and a lower blade disposed opposite each other, with at least one of the upper and lower blades being formed so that the radius of curvature of the arc at the inlet end of the metal strip in the conveying direction of the metal strip is greater than the radius of curvature of the arc at the outlet end.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent No. 5915640 (Claims 1, 2, Figures 5 to 9 wait) Utility Model Content

[0006] Problems to be solved by utility models

[0007] According to the structure of the inter-row slit blade disclosed in Patent Document 1, the continuous inter-row slits 90 (see Figure 2 ), the deformation of the cut surface caused by the upper blade 42 and the lower blade 46 re-entering the range of the previously processed inter-row slits 90 and the generation of so-called burrs caused by re-cutting due to the deviation of the cut portion can be minimized. In order to further reduce the deformation of the cut surface, it is necessary to prevent the upper blade 42 and the lower blade 46 from re-entering the range of the previously processed inter-row slits 90. Specifically, it is necessary to adjust the length of the inter-row slits 90 formed by the inter-row slit forming device 40 during a single punching process. More specifically, it is necessary to adjust the engagement depth (overlap amount) of the upper blade 42 and the lower blade 46 relative to the feed rate (delivery amount) of the metal strip 81 for each punching process.

[0008] like Figure 11 and Figure 12As shown, the two ends of the cutting edge 42A of the upper blade 42 and the lower blade 46 disclosed in Patent Document 1 (the two ends in the blade length direction: the ends 42B and 46B on the conveying direction inlet side and the ends 42C and 46C on the conveying direction outlet side) are both formed into an arc shape. Therefore, if the amount of engagement (overlap) in the height direction of the upper blade 42 and the lower blade 46 changes from a small state to a large state, the overlapping position of the cutting edge 42A and the cutting edge 46A moves to the conveying direction inlet side and the conveying direction outlet side. As a result, the change in the cutting length (L1 and L2) of the inter-row slit 90 for each stamping process becomes very large in response to the change in the overlap in the height direction of the upper blade 42 and the lower blade 46. Therefore, in order to prevent deformation of the cut surface and the generation of burrs and adjust the cutting length of the inter-row slit 90, there is a problem that the overlap in the height direction of the upper blade 42 and the lower blade 46 needs to be adjusted very precisely, which is complicated.

[0009] Solutions for solving problems

[0010] Therefore, the purpose of the present invention is to provide a column slit knife and a column slit forming device as follows: when forming continuous column slits, the cutting length can be determined regardless of the overlap amount of the upper knife and the lower knife while adjusting the cutting length so that the upper knife and the lower knife do not re-enter the range of the previously processed column slit.

[0011] To solve the above-mentioned problem, the inventors conducted intensive research and ultimately devised the following structure: an inter-row slot blade, characterized in that the inter-row slot blade forms inter-row slots extending in the conveyance direction of a metal strip having a plurality of heat exchange fins formed in the width direction at predetermined intervals of width, the inter-row slot blade comprising a first blade and a second blade disposed opposite each other across the metal strip, the first blade and the second blade each having an arc-shaped end in the blade length direction on the metal strip's conveyance inlet side, and the end of at least one of the first blade and the second blade on the metal strip's conveyance outlet side in the blade length direction being formed such that the position of the inter-row slot end on the conveyance outlet side remains constant regardless of the amount of overlap between the first blade and the second blade during formation of the inter-row slots.

[0012] Thus, when forming continuous inter-row slits, the cutting length can be determined regardless of the overlap between the upper and lower blades while adjusting the cutting length so that the upper and lower blades do not re-enter the range of the previously processed inter-row slits.

[0013] In addition, it is preferred that, for the end portion on the conveying direction outlet side of at least one of the first knife and the second knife, the angle formed by the cutting end edge of the first knife and the second knife and the side end edge standing relative to the cutting end edge is less than 90 degrees.

[0014] Furthermore, it is preferable that the end portion on the conveying direction outlet side is formed into a tapered shape in which the thickness of the blade gradually decreases as it approaches the tip portion of the side edge from the end portion on the conveying direction inlet side.

[0015] Thus, when forming continuous inter-row slits, the cutting length can be determined more simply regardless of the overlap between the upper and lower blades while adjusting the cutting length so that the upper and lower blades do not re-enter the range of the previously processed inter-row slits.

[0016] There is also a utility model for forming inter-row slits, characterized in that an inter-row slit blade is caused to contact and separate from a metal strip having a plurality of heat exchange fins formed thereon in a width direction, thereby forming inter-row slits in the metal strip at intervals of a predetermined width, wherein the heat exchange fins have through-holes through which heat medium circulation tubes pass or notches for mounting the heat medium circulation tubes, and any of the above-described inter-row slit blades is used as the inter-row slit blade.

[0017] Thus, when forming continuous inter-row slits, the cutting length can be determined regardless of the overlap between the upper and lower blades while adjusting the cutting length so that the upper and lower blades do not re-enter the range of the previously processed inter-row slits.

[0018] Effect of utility model

[0019] By adopting the structure of the present invention, when forming continuous inter-row slits, the cutting length can be adjusted so that the upper and lower blades do not re-enter the range of the previously processed inter-row slits. Regardless of the amount of overlap between the upper and lower blades, the cutting length can be determined. In addition, deformation and burr formation on the cut surface can be prevented. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is an overall view of a heat exchange fin manufacturing device equipped with the inter-row slit forming device of the present invention.

[0021] Figure 2 It is a plan view showing a portion of the metal strip in the longitudinal direction immediately after the inter-row slits are formed and before the metal strip is separated in the width direction.

[0022] Figure 3 This is a top view of the heat exchange fins.

[0023] Figure 4 This is an explanatory diagram of the upper blade of the inter-row slit blade according to the first embodiment.

[0024] Figure 5 It is a front view of the upper blade and the lower blade of the inter-row slit blade according to the first embodiment and a front view in a state where the amount of overlap between them is changed.

[0025] Figure 6 This is an explanatory diagram of the upper blade of the inter-row slit blade according to the second embodiment.

[0026] Figure 7 It is a front view of the upper blade and the lower blade of the inter-row slit blade according to the second embodiment and a front view of a state in which the amount of overlap between them is changed.

[0027] Figure 8 This is an explanatory diagram of the upper blade of the inter-row slit blade according to the third embodiment.

[0028] Figure 9 It is a front view of the upper blade and the lower blade of the inter-row slit blade according to the third embodiment and a front view of a state in which the amount of overlap between them is changed.

[0029] Figure 10 It is an explanatory diagram showing a modified example of the upper blade of the inter-row slit blade.

[0030] Figure 11 This is an explanatory diagram of the upper blade of the inter-row slit blade in the prior art.

[0031] Figure 12 It means to make Figure 11 The diagram shows an inter-row slit blade with its upper blade and lower blade overlapping each other. DETAILED DESCRIPTION

[0032] In this embodiment, a heat exchange fin manufacturing device 100 to which the present invention is applied will be described. Figure 1 As shown, the heat exchange fin manufacturing apparatus 100 in this embodiment includes an uncoiler 10, a stamping unit 20, a buffer unit 30, an inter-row slit forming device 40, a cutter 50, a suction unit 60, a stacking unit 70, and an operation control unit 200. The operation control unit 200 controls the operations of the uncoiler 10, the stamping unit 20, the inter-row slit forming device 40, the cutter 50, and the suction unit 60. The operation control unit 200 can employ a known configuration including an operation control program stored in a storage unit (not shown) and a computing unit, such as a CPU, that operates based on the operation control program.

[0033] The uncoiler 10 is used to unwind the aluminum plate 80, which is an unprocessed metal plate and serves as the material for the heat exchange fins 88, from a coil 11 wound around a reel (not shown). A known structure can be used. The stamping section 20 includes an oil supply section 21, a stamping die 22, a stamping mechanism 23, and an intermittent feed mechanism 24. The aluminum plate 80, to which processing oil is applied by the oil supply section 21, is processed by the stamping die 22 into a metal strip 81 of a predetermined shape (see FIG. 1 ). Figure 2 ), the stamping die 22 is brought into contact and separated by the stamping mechanism 23. The metal strip 81 is intermittently fed from the stamping section 20 by the intermittent feed mechanism 24 in synchronization with the operation of the stamping mechanism 23. The buffer section 30 in this embodiment is a space that allows the metal strip 81 fed from the stamping section 20 to relax downward, thereby buffering the difference between the forming length and the cutting length of each operation by the stamping section 20 and the cutting machine 50 described later. The buffer section 30 can also be composed of a guide member or the like that allows the metal strip 81 to maintain a predetermined relaxed shape.

[0034] The inter-row slit forming device 40 is used to form inter-row slits 90 extending in the conveying direction of the metal strip 81 at every required width dimension (every product width) with respect to the metal strip 81. The metal strip 81 is formed to have a plurality of rows of inter-row slits 90 in the width direction (in the direction orthogonal to the conveying direction of the heat exchange fins 88 in the same plane as the conveying direction of the heat exchange fins 88). Figure 2 and Figure 3 The elongated heat exchange fin 88 as the final product is shown. The inter-row slit blade 41 in the inter-row slit forming device 40 includes an upper blade 42 as a first blade and a lower blade 46 as a second blade. The upper blade 42 is held by an upper blade holder 44, and the lower blade 46 is held by a lower blade holder 48. The upper blade 42 and the lower blade 46 are arranged so as to face each other with the metal strip 81 interposed therebetween. The upper blade holder 44 is connected to the punch mechanism 23. The upper blade 42 and the upper blade holder 44, together, perform contact and separation motions relative to the lower blade 46 (the upper surface of the metal strip 81) in synchronization with the operation of the punch mechanism 23.

[0035] At least one inter-row slit 90 is formed for each product width in the metal strip 81. The metal strip 81, formed with the inter-row slit 90 by the inter-row slit forming device 40, becomes a product-width metal strip 82, which is intermittently conveyed by the conveyor device 51 installed in the cutter 50 along the product length. The product-width metal strip 82 is held by the suction surface 61 of the suction unit 60 installed downstream of the cutter 50. At this point, the length of the product-width metal strip 82 protruding from the cutter blade 52 of the cutter 50 is equal to the product length (the length of the heat exchange fins 88).

[0036] In this manner, the product-width metal strip 82 is cut by the cutting blade 52 into heat exchange fins 88, the final product, while the product-length portion of the front end is held by the suction surface 61. A stacking section 70 having a stacking platform 72 is provided below the suction surface 61 in the suction section 60. Stacking pins 71 are positioned upright on the stacking platform 72, aligned with the through-holes 89 formed in the heat exchange fins 88 held by the suction surface 61. Casters 73 are attached to the bottom of the stacking section 70, allowing for movement. When the motion control unit 200 temporarily stops the suction device (not shown) of the suction section 60, the heat exchange fins 88 fall from the suction surface 61 and are stacked on the stacking platform 72 along the thickness direction of the sheet, with the stacking pins 71 inserted through the through-holes 89. Once a predetermined number of heat exchange fins 88 have accumulated in the stacking section 70, the stacking section 70 is transported to the next process step by an operator or the like. The vacant accumulation section 70 is arranged in alignment with the suction section 60 , and the above-mentioned operation is repeated.

[0037] (First embodiment)

[0038] like Figure 4 As shown, in this embodiment, the cutting edge 42A, which serves as the blade portion of the upper blade 42 of the inter-row slit blade 41, has an arcuate curved edge (arc-shaped curved blade) at the inlet side of the metal strip 81 in the conveying direction. The end 42C, which is the outlet side of the metal strip 81 in the conveying direction, is formed as a side edge 42E that rises perpendicularly from the cutting edge 42A. In this embodiment, the outlet side end 42C of the upper blade 42 is positioned closer to the inlet side than the outlet side end edge of the main body of the upper blade 42 (the portion where the elongated hole 42D is formed) in the conveying direction of the metal strip 81. The width dimension (blade length dimension) of the cutting edge 42A is shorter than the width dimension of the main body of the upper blade 42. Long holes 42D that are longer in the height direction of the upper knife 42 are formed at two locations of the upper knife 42, and the installation height position of the upper knife 42 relative to the upper knife retaining frame 44 (the amount of protrusion of the cutting end edge 42A in the upper knife 42 from the upper knife retaining frame 44) can be adjusted at the position of the long holes 42D.

[0039] In addition, if Figure 5As shown, the end 46B on the conveying direction entrance side and the end 46C on the conveying direction exit side of the metal strip 81 in the cutting end edge 46A of the lower knife 46 of the inter-row slit knife 41 of this embodiment are both formed into arc-shaped curves (arc-shaped curved blades). In addition, the width direction dimension of the lower knife 46 and the width direction dimension of the cutting end edge 46A (knife length dimension) are formed to be the same dimension. Long holes 46D that are longer in the height direction of the lower knife 46 are formed at two locations of the lower knife 46, and the installation height position of the lower knife 46 relative to the lower knife holder 48 (the protrusion amount of the cutting end edge 46A in the lower knife 46 from the lower knife holder 48) can be adjusted at the position of the long hole 46D. Such a lower knife 46 is formed to be Figure 11 、 Figure 12 The upper blade 42 and the lower blade 46 of the prior art are shown in the same manner.

[0040] Figure 5 This is an explanatory diagram showing the inter-row slit blade 41 of the first embodiment and the meshing state of the upper blade 42 and the lower blade 46 when the inter-row slit blade 41 is used to form the inter-row slits 90 on the metal strip 81. Figure 5 The metal strip 81 in FIG. Figure 5 As shown, when the height engagement (overlap) between the upper blade 42 and the lower blade 46 in this embodiment is increased from a smaller state, the length of the inter-row slits 90 cut by the cutting edge 42A of the upper blade 42 and the cutting edge 46A of the lower blade 46 changes (increases) from L1 to L2. At this time, the position of the overlapping portion between the end 42B on the conveying direction inlet side of the upper blade 42 and the end 46B on the conveying direction inlet side of the lower blade 46 moves toward the conveying direction inlet side of the metal strip 81. In contrast, the position of the overlapping portion between the end 42C on the conveying direction outlet side of the upper blade 42 and the end 46C on the conveying direction outlet side of the lower blade 46 does not change. By employing such an upper blade 42 and lower blade 46, the length of the inter-row slits 90 formed in a single stamping process can be adjusted with half the accuracy of the overlap between the upper blade 42 and the lower blade 46, making it easier to adjust the cutting length of the inter-row slits 90.

[0041] The inter-row slit blades 41 in the inter-row slit forming device 40 are provided with a plurality of sets of upper blades 42 and lower blades 46 arranged in the width direction of the metal strip 81. This facilitates adjustment of the amount of overlap in the height direction between the upper blades 42 and lower blades 46 for each set, significantly reducing the time required to adjust the cutting length of the inter-row slits 90 in the inter-row slit forming device 40 as a whole.

[0042] (Second embodiment)

[0043] Next, refer to Figure 6 and Figure 7 , while explaining the inter-row slit knife 41 of the second embodiment. For the same structure as that of the first embodiment in the inter-row slit knife 41 of this embodiment, repeated description is omitted here by using the same figure marks as those used in the previous embodiment. The upper knife 42 in this embodiment is a modified example of the first embodiment in which the specific shape of the end 42C on the conveying direction outlet side of the upper knife 42 of the first embodiment is changed. In this embodiment, when the amount of overlap in the height direction between the upper knife 42 and the lower knife 46 is changed from a smaller state to a larger state, the cutting length of the inter-row slit 90 cut by the cutting edge 42A of the upper knife 42 and the cutting edge 46A of the lower knife 46 is changed from L1 to L2. Furthermore, the following point is the same as the first embodiment: the position of the overlapping portion between the end 42B on the conveying direction inlet side of the upper knife 42 and the end 46B on the conveying direction inlet side of the lower knife 46 moves toward the conveying direction inlet side of the metal strip 81, while the position of the overlapping portion between the end 42C on the conveying direction outlet side of the upper knife 42 and the end 46C on the conveying direction outlet side of the lower knife 46 does not change.

[0044] In this embodiment, the end 42C of the upper blade 42 on the conveying direction outlet side is formed in a tapered shape, based on the basic configuration of the upper blade 42 in the first embodiment, with the wall thickness of the upper blade 42 gradually becoming thinner as it moves from the inlet side to the outlet side of the metal strip 81 in the conveying direction. By adopting this configuration of the end 42C on the conveying direction outlet side, the end on the conveying direction outlet side during the formation of the inter-row slits 90 (during the stamping process) is formed by the sharp (tapered) shape of the upper blade 42. This minimizes the distortion (deformation and burr formation) of the cut shape caused by the end 42C on the conveying direction outlet side. This is preferable in that the finished shape of the metal strip 82 and the heat exchange fins 88 is improved in terms of product width.

[0045] (Third embodiment)

[0046] Next, refer to Figure 8 and Figure 9, while explaining the inter-row slit knife 41 of the third embodiment. For the same structure as that of the previous embodiment in the inter-row slit knife 41 of this embodiment, repeated description is omitted here by using the same figure marks as those used in the previous embodiment. The position of the end 42C (side edge 42E) on the conveying direction outlet side of the cutting edge 42A of the upper knife 42 of the inter-row slit knife 41 of this embodiment is formed at the same position as the end edge position on the conveying direction outlet side of the main body of the upper knife 42. The shape of the lower knife 46 in this embodiment is formed to be the same shape as the shape of the upper knife 42 in this embodiment. That is, the position of the end 46C on the conveying direction outlet side of the cutting edge 46A of the lower knife 46 is formed at the same position as the end edge position on the outlet side of the main body of the lower knife 46. Thus, even if the overlap amount between the upper knife 42 and the lower knife 46 is increased or decreased in the same manner as in the first and second embodiments, the change in the cutting length (L1 and L2) of the inter-row slit 90 based on the cutting edge 42A of the upper knife 42 and the cutting edge 46A of the lower knife 46 can be made only on the side of the end portions 42B and 46B on the entrance side of the conveying direction.

[0047] By adopting the structure of the upper knife 42 and the lower knife 46 in this embodiment, the manufacturing cost of the upper knife 42 and the lower knife 46 can be reduced, and the position confirmation of the end position of the inter-row slit 90 on the outlet side of the conveying direction when adjusting the cutting length of the inter-row slit 90 formed in a single stamping process becomes easy, which is preferred.

[0048] The above description of the inter-row slit blades 41 and the inter-row slit forming device 40 equipped with the inter-row slit blades 41 of the present invention is based on an embodiment. However, the present invention is not limited to the above embodiment. For example, the above embodiment illustrates an embodiment in which the metal strip 81 is formed with through-holes 89 through which a heat medium circulation tube (not shown) passes. However, the present invention is not limited to this embodiment. Alternatively, the metal strip 81 may be formed with a notch for receiving the heat medium circulation tube from one end edge toward the other end edge in the width direction of the heat exchange fin 88.

[0049] In the above embodiment, the embodiment in which the end portion 42B (46B) of the metal strip 81 on the inlet side of the conveying direction is formed as an arcuate curved blade is exemplified, but the present invention is not limited to this embodiment. Alternatively, the cut edge 42A (46A) of the end portion of the metal strip 81 on the inlet side of the conveying direction may be formed as a curved blade that gradually moves away from the conveying surface of the metal strip 81 as it moves from the outlet side of the conveying direction of the metal strip 81 to the inlet side.

[0050] In the first and second embodiments, the side edge 42E of the end portion 42C on the conveying direction outlet side of the upper blade 42 is formed to be orthogonal to the cut edge 42A (the upper surface of the metal strip 81), but the present invention is not limited to this embodiment. Alternatively, the side edge 46E of the end portion 46C on the conveying direction outlet side of the lower blade 46 may be formed to be orthogonal to the cut edge 46A (the lower surface of the metal strip 81).

[0051] In addition, if Figure 10 As shown, a method can also be adopted in which the side edge 42E of the end portion 42C (46C) on the conveying direction outlet side of at least one of the upper blade 42 or the lower blade 46 is formed at an acute angle relative to the cut edge 42A (46A) (the upper surface or the lower surface of the metal strip 81). In short, the specific method is not particularly limited as long as the following method is adopted: regardless of the amount of overlap in the height direction between the upper blade 42 and the lower blade 46 (even if the engagement depth is changed), the formed end position of the end portion 42C or 46C on the conveying direction outlet side of the inter-row slit 90 formed in a single punching process can be set to a constant position.

[0052] Furthermore, while the above embodiment illustrates a method in which the metal strip 81 is conveyed horizontally within the inter-row slit forming device 40, this is not limiting. The direction in which the metal strip 81 is conveyed relative to the inter-row slit forming device 40 can be any direction, typically vertical. In this case, a method can also be employed in which the first and second blades engage and disengage with respect to the upper and lower surfaces of the metal strip 81 in directions perpendicular to the upper and lower surfaces of the metal strip 81, using a separate drive source for the inter-row slit device independent of the punch mechanism 23.

[0053] Furthermore, it is also possible to adopt a form in which the modified examples described in the above embodiment are appropriately combined.

Claims

1. An inter-row slit knife, characterized in that: The inter-row slit blade forms inter-row slits extending in the conveying direction of a metal strip having a plurality of heat exchange fins formed thereon in the width direction at predetermined intervals. The heat exchange fins have through holes for passing a heat medium circulation pipe or notches for installing the heat medium circulation pipe. The inter-row slit blade includes a first blade and a second blade that are arranged opposite to each other with the metal strip interposed therebetween. The ends of the first blade and the second blade on the conveying direction inlet side of the metal strip in the blade length direction are each formed into an arc-shaped curve. The end portion of the metal strip on the conveying direction outlet side in the blade length direction of at least one of the first knife and the second knife is formed into the following shape: regardless of the overlap amount of the first knife and the second knife when forming the inter-row slit, the formation end position of the inter-row slit on the conveying direction outlet side becomes a constant position.

2. The inter-row slit knife according to claim 1, characterized in that: At the end portion on the conveying direction outlet side of at least one of the first and second blades, an angle formed by the cutting edge of the first and second blades and a side edge rising from the cutting edge is 90 degrees or less.

3. The inter-row slit knife according to claim 2, characterized in that: The end portion on the conveying direction outlet side is formed into a tapered shape in which the thickness of at least one of the first blade and the second blade gradually decreases as it approaches the tip portion of the side edge from the end portion on the conveying direction inlet side.

4. A device for forming inter-row slits, characterized in that: The inter-row slit forming device causes an inter-row slit blade to contact and separate from a metal strip having a plurality of heat exchange fins formed thereon in a width direction, thereby forming inter-row slits on the metal strip at predetermined width intervals. The heat exchange fins have through holes for passing heat medium circulation pipes or notches for installing the heat medium circulation pipes. As the inter-row slit blade, the inter-row slit blade according to any one of claims 1 to 3 is used.

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