CN112620519B

CN112620519B - Cutting device

Info

Publication number: CN112620519B
Application number: CN202010424724.4A
Authority: CN
Inventors: 山崎贵雄; 吉原总勇
Original assignee: Hidaka Seiki KK
Current assignee: Hidaka Seiki KK
Priority date: 2019-10-08
Filing date: 2020-05-19
Publication date: 2023-07-14
Anticipated expiration: 2040-05-19
Also published as: JP6647613B1; CN112620519A; JP2021058918A

Abstract

The invention provides a cutting device, which can prevent deformation of a metal strip body and abrasion of a cutting knife when cutting the metal strip body in the width direction, and can realize further miniaturization in the width direction. A cutting device is provided with an upper die (10) and a lower die (20) which are oppositely arranged so as to be capable of approaching and moving away from each other in a manner of sandwiching the metal strip, wherein the upper die is provided with a punch die (11), the lower die is provided with a die (21), the die is provided with a punch die entry part (22) which is opened in the width dimension of the inter-row part, and the punch die is provided with a cutting knife which cooperates with the opening end edge part of the inter-row slit of the punch die entry part in the width direction to form the inter-row slit in the metal strip.

Description

Cutting device

Technical Field

The present invention relates to a cutting device, and more particularly, to a cutting device: when cutting the inter-row portions of the metal strip in order to divide the metal strip having a plurality of rows of heat exchanger fins formed in the width direction into product widths, the heat exchanger fins of the product widths are not damaged.

Background

Heat exchangers used in air conditioners and the like are formed by inserting a heat transfer pipe into a heat radiating fin having a heat transfer pipe penetrating portion. The heat radiation fins used in such a heat exchanger are formed as follows: a plurality of rows of heat radiating fins are formed in a concentrated manner by a press die in the width direction of a long body made of a metal thin plate, and cut portions called inter-row slits are formed between rows of heat transfer tube penetrating portions, and then the cut portions are divided (separated) to form a metal strip body having a product width, and then cut into predetermined lengths. As a manufacturing apparatus of such a heat radiating fin, for example, structures disclosed in patent document 1 (japanese patent No. 5915640) and patent document 2 (japanese patent No. 5716820) are known.

Prior art literature

Patent literature

Patent document 1: japanese patent No. 5915640 (paragraphs 0031-0034 of the specification; FIG. 6, etc.)

Patent document 2: japanese patent No. 5716820 (paragraphs 0020 to 0025; FIG. 5, etc.)

Disclosure of Invention

Problems to be solved by the invention

As shown in fig. 7, patent document 1 and patent document 2 disclose the following structures: the upper blade UB fixed to the side surface of the upper blade holder UH by the screw BT and the lower blade LB fixed to the side surface of the lower blade holder LH by the screw BT sandwich the metal strip KO in the upper and lower directions to form a cut-off portion called an inter-row slit, and the upper blade holder UH is held by the upper die UK and the lower blade holder LH is held by the lower die LK. According to this structure, the forces in the directions of the arrows a and B in fig. 7 act on the upper blade UB and the lower blade LB, and thereby the force to tilt the metal strip KO as indicated by the arrow C acts on the metal strip KO as a resultant force. Thus, there are the following problems: when the inter-row slit is formed, deformation such as burrs is generated in the metal strip KO, and abrasion of the upper blade UB and the lower blade LB of the cutting device is serious.

As shown in fig. 7, the upper blade UB is attached to the right side surface of the upper blade holder UH held by the upper die UK, the lower blade LB is attached to the left side surface of the lower blade holder LH held by the lower die LK, and the right side surface of the upper blade holder UH and the left side surface of the lower blade holder LH are disposed on the same vertical line. Therefore, there are also the following problems: there is a limit in downsizing the width dimension of the cutting device forming the inter-row slit.

Solution for solving the problem

Accordingly, the present invention has been made to solve the above-mentioned problems, and its objects are as follows. That is, an object of the present invention is to provide a cutting device capable of preventing deformation such as burrs from occurring in a metal strip having a product width formed by cutting a strip-shaped metal strip having a plurality of rows of heat transfer tube penetrating portions through which heat transfer tubes penetrate in a width direction, for dividing the strip-shaped metal strip in the width direction, and reducing wear of an upper blade and a lower blade of the cutting device.

The inventors have made intensive studies to solve the above problems, and as a result, have devised the following configurations. That is, the present invention is a cutting device for cutting an inter-row portion of a heat transfer tube penetrating portion with respect to a metal strip, the metal strip being formed by forming a plurality of rows of the heat transfer tube penetrating portions in a width direction of a long body made of a thin plate made of metal, the cutting device being characterized by comprising an upper die and a lower die which are arranged so as to be movable to be close to each other so as to be apart from each other in a plate thickness direction, the upper die being mounted with a punch die, the lower die being mounted with a die, the die being formed with a punch die entering portion which is opened in a width dimension of the inter-row portion and into which the punch die can enter, and a cutter which is formed to cut the metal strip in cooperation with an opening end edge portion in the width direction of the inter-row portion of the punch die entering portion when entering the punch die entering portion.

Accordingly, since the forces acting in the width direction of the metal strip can be offset when the metal strip is cut in order to divide the metal strip at the inter-column portions, deformation such as burrs can be prevented from occurring when the metal strip is formed into a metal strip having a product width, and wear between the upper blade and the lower blade of the cutting device can be reduced. Further, since the upper blade is formed in the punch die and the lower blade is formed in the die, the dimension of the cutting device in the width direction can be greatly reduced as compared with the conventional technique.

Preferably, the upper die has a pin penetrating in a height direction of the upper die, and the pin penetrates the heat transfer pipe penetrating portion to enter the die when the cutoff blade reaches the opening end edge portion of the punch die entering portion, and the die has an abutment pad abutting the pin entering the die and a biasing member biasing the abutment pad toward the punch die.

Thus, the metal strip having the product width obtained by cutting the metal strip can be pushed up to the upper surface (conveying surface) of the die, and the removal of the metal strip having the product width from the die can be automated, so that the cutting portion for dividing the metal strip in the width direction can be formed efficiently.

Further, it is preferable that the punch die located at the position of one end portion in the width direction of the metal strip is provided with a protruding piece slidable on an inner wall surface of the punch die entry portion instead of the cutting blade located on the outer side in the width direction of the metal strip, and that the contact pad of the punch die located at the position of the one end portion in the width direction of the metal strip is formed with a recess matching the position of the protruding piece.

Accordingly, the force acting on the metal strip in the width direction can be offset even at one end in the width direction of the metal strip when cutting for dividing the metal strip in the width direction, and deformation such as burrs occurring in the metal strip having the product width can be prevented when cutting the metal strip.

Further, it is preferable that the contact pad protrudes toward the punch die side from the opening edge portion of the punch die entry portion, and that a lower end portion position of the tab is located toward the die side from a lower end portion position of the cutting blade.

Thus, the metal strip having the product width after the metal strip is cut in the width direction can be pushed up to the upper surface of the die.

ADVANTAGEOUS EFFECTS OF INVENTION

By adopting the structure of the cutting device of the present invention, the inter-row slit can be formed by the punch-die structure, and the force acting on the metal strip in the width direction can be offset by the upper blade and the lower blade. Accordingly, after the metal strip is divided in the width direction, the metal strip having the product width can be prevented from being deformed such as burrs, and wear between the upper blade and the lower blade of the cutting device can be reduced. Further, since the upper blade is formed in the punch die and the lower blade is formed in the die, the dimension of the cutting device in the width direction can be greatly reduced as compared with the conventional technique.

Drawings

Fig. 1 is a schematic front view of a heat exchanger manufacturing apparatus with a cutting device according to the present embodiment.

Fig. 2 is a main part sectional view of a cutoff device of the heat exchanger manufacturing apparatus shown in fig. 1.

Fig. 3 is a cross-sectional view showing the operation of the cutting device according to the present embodiment.

Fig. 4 is a cross-sectional view showing the operation of the cutting device continuous with fig. 3.

Fig. 5 is a cross-sectional view showing the operation of the cutting device continuous with fig. 4.

Fig. 6 is a front cross-sectional view of a main part of a modification of the cutting device.

Fig. 7 is an enlarged side view of a main part of a cutting device according to the prior art.

Detailed Description

Hereinafter, an embodiment of the cutting device 100 according to the present invention will be specifically described with reference to the drawings. The heat exchanger manufacturing apparatus NS of the present embodiment has a structure as shown in fig. 1. That is, the elongated body CJ made of a metal sheet such as an aluminum sheet, which is a material to be processed of the heat exchanger fin, is wound into a roll and pulled out from the unwinder UC through the pinch roll PR. The drawn elongated body CJ is inserted into the oil applying device OA, and after the processing oil is attached to the surface of the elongated body CJ, the elongated body CJ is intermittently fed to the die device ME provided inside the press die device PM. The die set ME is a forward die, and is internally provided with an upper die set UD capable of moving up and down and a lower die set LD in a static state. A plurality of collar rows (rows of heat transfer tube through-holes) are formed in the longitudinal body CJ passing through the die device ME in the width direction, and the collar rows (rows of heat transfer tube through-holes) are formed by a single row of collar-equipped through holes (not shown) as heat transfer tube through-holes along the longitudinal direction of the longitudinal body CJ, which is the conveying direction. Thereafter, a member in which a plurality of collar rows (rows of heat transfer tube penetrating portions) are formed in the width direction of the elongated body CJ is referred to as a metal strip KO. The metal strip KO is cut along the longitudinal direction thereof by the cutting device 100 to form a plurality of narrow strips of a single row of collars, that is, a metal strip KO2 having a product width, and then the metal strip KO2 having the product width is cut into a predetermined length and stored in the stacker ST as rectangular strip-shaped heat sinks.

Fig. 2 is a main part sectional view of the cutting device 100 of the present embodiment, and more specifically, a view showing a right half of a cut surface perpendicular to the output direction of the metal strip KO from a downstream side surface to an upstream side in the conveying direction of the metal strip KO. The cutting device 100 of the present embodiment is assembled as a part of the press die device PM, and the upper die 10 and the lower die 20 are disposed so as to be movable toward and away from each other by a die approaching and separating movement portion and an operation control portion (neither shown) of the press die device PM so as to sandwich the metal strip KO in the thickness direction. A plurality of punch dies 11 are mounted on the upper die 10, and a die 21 corresponding to the plurality of punch dies 11 is mounted on the lower die 20.

A cutting blade 12 is formed at the lower end of the punch die 11 attached to the upper die 10 so as to correspond to the inter-row portions of the heat transfer tube penetrating portions PH formed in a plurality of rows in the width direction of the metal strip KO, and the cutting blade 12 is used to form inter-row slits RS as cutting portions. The cutting blade 12 of the punch die 11 forms the inter-row slit RS in the metal strip KO by the interaction of the punch (die cutting) with the opening end edge 22A of the punch die entry portion 22 into which the punch die 11 is inserted, which is attached to the lower die 20.

In the planar center portion of the punch die 11 as in the present embodiment, a through hole 14 penetrating the punch die 11 in the height direction may be formed, and the pin 16 may be inserted through the through hole 14 to fix the pin 16 by a known method such as screwing from the side surface of the punch die 11. The lower end portion of the pin 16 attached to the punch die 11 is located (projected) on the lower die 20 (die 21) side from the lower end portion of the cutter blade 12, and is provided at the planar position of the heat transfer tube penetration portion PH formed in the metal strip KO. Since the outer diameter of the pin 16 is not larger than the outer diameter of the heat transfer tube (not shown), the pin 16 can be inserted into the die 21 while being inserted into the heat transfer tube penetration portion PH of the metal strip KO when the upper die 10 and the lower die 20 are clamped (when the cutoff blade 12 reaches (abuts against) the opening edge portion 22A of the punch die entrance portion 22).

As clearly shown in fig. 2, the punch die 11 located at the position of one end portion of the metal strip KO in the width direction is provided with a tab 18 in place of the cutting blade 12 at the outer portion of the metal strip KO in the width direction. That is, the punch die 11 disposed at the right end in fig. 2 is formed with the cutter 12 and the tab 18. The tab 18 is formed to be slidable on an inner wall surface of an outer side of the punch die entry portion 22 at a position located at one end portion in the width direction of the metal strip KO. When such a tab 18 is disposed, and the inter-row slit RS is formed in a portion located at the position of one end in the width direction of the metal strip KO, a reaction force that counteracts the force in the direction in which the metal strip KO tilts due to the metal strip KO being in the cantilever (cut by the single blade) state can be obtained.

More specifically, the inter-row slit RS is formed only on the inner side in the width direction of the portion of the metal strip KO located at the position of one end in the width direction, and the upper die 10 is applied with a force to tilt in the direction of the arrow a in fig. 2, as in the conventional technique. At this time, the tab 18 enters the punch die entering portion 22 while sliding on the outer inner wall surface of the punch die entering portion 22 on the outer side in the width direction of the metal strip KO, and therefore, a reaction force is obtained from the outer wall surface of the punch die entering portion 22 in the width direction against the force tilting in the direction of the arrow a. By this reaction force, the force of the upper die 10 tending to tilt in the direction of arrow a can be canceled, deformation of the metal strip KO located at the position of one end in the width direction can be prevented, and wear of the punch die 11 at that position can be reduced.

As described in the present embodiment, it is preferable that the lower end position of the tab 18 is located (projected) on the side of the lower die 20 (die 21) than the lower end position of the cutting blade 12 in the punch die 11 on which the tab 18 is formed. Accordingly, the reaction force can be obtained at a constant level when the cutting blade 12 is in contact with the metal strip KO, which is preferable.

Next, the lower die 20 will be described. A die 21 is mounted on the lower die 20 in a state corresponding to the position of the punch die 11 mounted on the upper die 10. The die 21 is provided with a punch die entering portion 22, and the punch die entering portion 22 is formed in a planar shape substantially identical to the planar shape of the punch die 11, and can advance and retreat while sliding the punch die 11. The opening edge 22A, which is the upper end opening of the punch die entry portion 22, is opened with the width dimension of the inter-row slit RS. Further, an abutment pad 23 that abuts against the metal strip KO and the lower end portion of the cutting blade 12 penetrating the metal strip KO is housed in the punch die entry portion 22.

The contact pad 23 of the present embodiment is formed by integrally attaching a base portion 23D having a larger diameter than the small diameter portion 23B to a column formed of the large diameter portion 23A and the small diameter portion 23B by a known method such as screw fixation. In addition to a two-piece structure in which the large diameter portion 23A and the small diameter portion 23B are assembled by a known method such as screw fixation, a single-piece structure may be employed. In such contact pad 23, after the large diameter portion 23A and the small diameter portion 23B are accommodated in the punch die entry portion 22, the base portion 23D is attached to the bottom surface of the small diameter portion 23B from the side of the accommodating portion 26 accommodating the urging member 25.

The contact pad 23 in the die 21 located at the position of one end (right end in fig. 3) of the metal strip KO in the width direction is formed with a recess 23C, and the recess 23C matches the position of the tab 18 formed in the punch die 11 on the same plane. Such a recess 23C is preferably formed in order to allow the protruding piece 18 formed in the punch die 11 to be fitted in the contact pad 23 in a concave-convex manner, so that the punch die 11 and the die 21 can be reliably clamped at the time of forming the inter-row slit RS, and a press working with high dimensional accuracy can be performed.

Further, a biasing member 25 for biasing the upper Fang Duidi contact pad 23 and a base 23D are disposed in the lower die 20 at a position immediately below the contact pad 23. The inner diameter width dimension (inner diameter dimension) of the housing portion 26 housing the urging member 25 and the base portion 23D is formed larger than the width dimension (outer dimension) of the small diameter portion 23B of the contact pad 23, and the height position of the upper end portion of the housing portion 26 can be adjusted to limit the height position of the upper end portion of the base portion 23D. This enables the initial height position of the contact pad 23 to be set appropriately. In the present embodiment, the initial height position of the contact pad 23 is set to be the same plane height as the height position of the opening end edge portion 22A of the punch die entry portion 22 (the upper surface of the die 21) or a height position slightly protruding from the opening end edge portion 22A of the punch die entry portion 22.

The cutting blade 12 enters the punch die entry portion 22 together with a part of the metal strip KO to form an inter-row slit RS in the metal strip KO, thereby forming a metal strip KO2 having a product width. After that, when the punch die 11 and the die 21 are separated, the contact pad 23, which is biased upward by the biasing member 25, rises together with a part of the metal strip KO2 having the product width, and the metal strip KO2 having the product width can be returned to the conveying surface as the initial position. After continuously and intermittently feeding the metal strip KO to the cutting device 100 in this state, the above operation can be repeatedly performed, and the inter-row slits RS can be continuously formed in the inter-row portions of the metal strip KO.

The operations of the respective components of the cutting device 100 are performed by an operation control unit in the press mold device PM. The operation control unit may be realized by an operation control program previously installed in a storage unit of a separate personal computer and a CPU that operates according to the operation control program. Such an operation control unit may be commonly used as a central control unit of the heat exchanger manufacturing apparatus NS.

Next, a process for forming the inter-row slit RS in the metal strip KO in the cutting device 100 of the present embodiment will be described. As shown in fig. 3, the metal strip KO is supplied to the cutting device 100 assembled at a position downstream of the press die device PM by a not-shown conveying device. Next, as shown in fig. 4, the die approaching/separating moving portion, which is not shown, moves the upper die 10 toward the lower die 20 together with the upper die frame UD of the press die device PM, and the cutting blade 12 formed by the punch die 11 attached to the upper die 10 is moved into the punch die entering portion 22 of the die 21 attached to the lower die 20. At this time, the cutting blade 12 causes a part of the metal strip KO to enter the punch die entering portion 22 in a state pressed by the contact pad 23, and forms an inter-row slit RS (see fig. 5) at a predetermined position of the metal strip KO (at an inter-row portion where the plurality of rows of heat transfer tube penetrating portions PH are formed in the width direction of the metal strip KO) in cooperation with the opening end edge portion 22A of the punch die entering portion 22.

After the inter-row slit RS is formed in the metal strip KO, an operation control unit, not shown, performs a process of separating the upper die 10 from the lower die 20 together with the upper die frame UD by the die approaching/separating moving unit. At this time, as shown in fig. 5, the contact pad 23 moves upward in the punch die entry portion 22 by the urging force from the urging member 25, and returns a part of the metal strip KO having entered the punch die entry portion 22 to the height position of the opening end edge portion of the punch die entry portion 22 as the initial position. The metal strip KO at this time is divided (separated) in the width direction at the position of the inter-row slit RS, and a so-called metal strip KO2 having a product width is formed. Thereafter, the metal strip KO2 having the product width is discharged from the cutting device 100 by the operation of a not-shown conveyor, and the metal strip KO is supplied to the cutting device 100, and thereafter, the same operation is repeated by the operation control unit. As described above, the forming step of forming the inter-row slits RS in the metal strip KO by the cutting device 100 according to the present embodiment is performed in synchronization with the press forming step of pressing the metal strip KO by the press die device PM.

The mode of moving the upper die 10 and the lower die 20 closer to and away from each other in the die approaching and separating movement portion in the above embodiment is described, but the present invention is not limited to this mode. The mold approaching/separating movement portion may be configured to move the lower mold 20 approaching/separating from the upper mold 10, or may be configured to move both the upper mold 10 and the lower mold 20 approaching/separating from each other. That is, the mold approaching/separating movement portion may be capable of approaching/separating at least one of the upper mold 10 and the lower mold 20 with respect to the other.

Further, although the embodiment above is not limited to this configuration, the tab 18 is formed instead of the cutting blade 12 on the outer side in the width direction of the punch die 11 located at the position of one end in the width direction of the metal strip KO, and the lower end position of the tab 18 is located below the lower end position of the cutting blade 12. In short, the reaction force acting on the metal strip KO in the tilting direction of the metal strip KO may be obtained when the inter-row slit RS is formed, and a portion that slides on the outer wall surface of the punch die entry portion 22 at the same time as or before the cutting blade 12 enters the punch die entry portion 22 may be provided.

In the above embodiment, the pin 16 is described in a state of penetrating the upper die 10 and the punch die 11 in the height direction, but the pin 16 is not limited to the above embodiment. For example, as shown in fig. 6, which is a front cross-sectional view of a main part of a modification of the cutting device, a configuration may be adopted in which the pin 16 is inserted only in the height direction of the upper die 10, as long as the pin is positioned outside the planar region of the punch die 11 and is in a position where the pin can abut against the abutment pad 23 (a position in the planar region of the large diameter portion 23A in fig. 6).

The description has been made of a case where the cutting device 100 in the present embodiment is assembled to a part of the press mold device PM, but a case where the cutting device 100 is independent of the press mold device PM may be employed. In this case, the mold approaching/separating moving section, the operation control section, and the like for approaching/separating the upper mold 10 and the lower mold 20 may be appropriately arranged as needed.

In addition, various modifications in the above-described embodiments may be appropriately combined with each other.

Claims

1. A cutting device for cutting an inter-row portion of heat transfer tube penetrating portions with respect to a metal strip formed by forming a plurality of rows of heat transfer tube penetrating portions for penetrating a heat transfer tube in a width direction in a longitudinal body made of a metal thin plate,

the cutting device comprises an upper die and a lower die which are oppositely arranged in a manner of being capable of approaching and separating from each other in a plate thickness direction, wherein the upper die is provided with a punch die, the lower die is provided with a die,

a punch die entry portion which is opened in a width dimension of the inter-row portion and into which the punch die can enter is formed in the die,

the punch die is provided with a cutting blade that cuts the metal strip by cooperating with an opening edge portion in the width direction of the inter-row portion of the punch die entrance portion when the cutting blade enters the punch die entrance portion.

2. The cutoff device according to claim 1, wherein,

the upper die has a pin penetrating in the height direction of the upper die, and when the cutter reaches the opening end edge portion of the punch die entering portion, the pin penetrates the heat transfer tube penetrating portion and enters the inside of the die,

the die tool has an abutment pad that abuts the pin that enters the inside of the die tool, and a biasing member that biases the abutment pad toward the punch tool.

3. A cutting device according to claim 2, wherein,

the punch die located at a position of one end portion in the width direction of the metal strip is provided with a tab slidable on an inner wall surface of the punch die entry portion in place of the cutter blade located on the outer side in the width direction of the metal strip,

the die pad located at the position of the one end portion in the width direction of the metal strip is formed with a recess matching the position of the tab.

4. A cutting device according to claim 3, wherein,

the contact pad protrudes toward the side of the punch die closer to the open end edge of the punch die entry portion,

the lower end position of the tab is located closer to the die than the lower end position of the cutoff knife.