JP2003115567A - Machine and method for bending corrugated fin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a machine and a method for bending a plate material into a corrugated fin having a rectangular waveform cross-section by one step. SOLUTION: A first punch unit 70 comprises a first punch group 80 including a plurality of first punches 140, and a first drive cam 84 for pressing the first punch 140 in the first punch group 80 sequentially against the first side 130 of a plate material M while resisting against an urging member 160. A second punch unit 74 comprises a second punch group 90 including a plurality of second arranged punches 150, and a second drive cam 94 for pressing the second punch 150 in the second punch group sequentially against the other side 131 of the plate material M while resisting against an urging member 190 wherein a rectangular waveform part 60 is formed by bending the plate material M sequentially from one end side toward the other end side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a corrugated fin bending apparatus and a bending method for bending a plate material into a corrugated fin having a rectangular wave cross section.

[0002]

2. Description of the Related Art In recent years, the miniaturization of computers has advanced, and the degree of integration of circuits inside them has increased remarkably. With the increase in the degree of integration, the temperature rise inside the housing due to the heat dissipation of the CPU (central processing unit) has been noted as a serious problem. Currently, for cooling the CPU, a method is adopted in which heat generated by the CPU is guided to a radiation fin by a heat pipe and air is cooled by a motor fan. As described above, the radiation fins used in small electronic devices such as computers are generally manufactured by aluminum die casting. However, due to the recent demand for increasing the heat radiation area of the heat radiation fins and the demand for lowering the manufacturing cost of the heat radiation fins, instead of aluminum die casting, a thin metal plate with excellent heat radiation performance such as aluminum is bent into a corrugated heat radiation fin. Attempts to use it have begun. As a bending method for forming a thin metal plate into a corrugated fin having a rectangular wave cross section, there is a bending process shown in FIG.

In the conventional processing method for forming a corrugated fin, the thin plate 1002 has two gears 1000, 100.
A waveform is formed by passing between 1s. Thereafter, another device 1003 compresses the thin plate 1002 in the longitudinal direction to shape the shape and continuously form the peaks and valleys alternately, and the corrugated fins 1005 are obtained by cutting with the cutting tool 1004. To be

[0004]

In order to obtain a corrugated fin from a thin plate as described above, a total of two steps are required, a bending deformation step using a gear and a compression operation in the longitudinal direction of the thin plate by the apparatus 1003. At least 2 like this
Not only one process is required, but gears 1000, 1
When 001 is used to form a waveform, there is a problem that the higher the heights of the peaks and the valleys with respect to the pitch of the peaks and the valleys, the more difficult the machining becomes. is there. If you want to increase the height of the corrugated fin, you will need a huge gear. Moreover, the gear 100
When the thin plate 1002 is formed into a corrugated shape by 0, 1001, the shape of the corrugated fin 1005 obtained as shown in FIG. 15B becomes a substantially sine wave shape.
There is also a problem that it is not possible to obtain a rectangular wave shape in cross section as in (C) in which the edge of the inner corner is bent at a right angle. Further, more shaping steps are required to obtain a corrugated fin having a rectangular wave cross section. Then, this invention solves the said subject and an object of this invention is to provide the corrugated fin bending apparatus and corrugated fin bending method which can bend a board | plate material in the corrugated fin of a rectangular cross section in one process. There is.

[0005]

According to a first aspect of the present invention, there is provided a corrugated fin bending apparatus for bending a plate material into a corrugated fin having a rectangular wave cross section, which is arranged on one surface side of the plate material. It has a 1st punch unit and a 2nd punch unit arrange | positioned at the other surface side of the said board | plate material, The said 1st punch unit is a plurality of 1st arranged.
A first punch group having punches; and a first drive cam for sequentially pressing the first punch of the first punch group against one side of the plate material against the biasing force of a biasing member. The second punch unit includes a plurality of arranged second punch units.
A second punch group having a punch; and a second drive cam for sequentially pressing the second punch of the second punch group against the other surface side of the plate material against the urging force of the urging member. Then, by further moving the first drive cam and the second drive cam, the first punch of the first punch group is pressed against one surface side of the plate material, and the second punch is moved to the other surface of the plate material. The corrugated fin bending apparatus is provided with a drive unit that presses the plate member toward a side surface and sequentially bends the rectangular wave-shaped portion in section from one end side to the other end side.

In the first aspect, the corrugated fin bending apparatus roughly has a first punch unit and a second punch unit. The first punch unit is arranged on one surface side of the plate material. The second punch unit is arranged on the other surface side of the plate material. The first punch unit has a first punch group, a biasing member, and a first drive cam. The second punch unit also includes the second punch group, the biasing member, and the second punch group.
It has a drive cam. The first punch group has a plurality of first punches arranged. The first drive cam is for sequentially pressing the first punch of the first punch group against one side of the plate material against the biasing force of the biasing member. The second punch group has a plurality of aligned second punches. The second drive cam sequentially presses the second punch of the second punch group against the urging force of the urging member against the other surface side of the plate material. The drive unit moves the first drive cam and the second drive cam to press the first punch of the first punch group against one side of the plate material and the second punch against the other surface side of the plate material. Then, the drive part sequentially bends the rectangular wave-shaped portion in cross section from one end side to the other end side of the plate material. As a result, the plate material, which is a raw material, can be bent into a corrugated fin having a rectangular wave cross section in one step.

According to a second aspect of the present invention, in the corrugated fin bending apparatus according to the first aspect, the pressing end portion of the first punch pressed against one surface side of the plate material and the other surface side of the plate material. At the pressing end of the second punch that is pressed against, the flat tip surface and the side surface are perpendicular to each other. According to the second aspect of the present invention, the pressing end portion of the first punch and the pressing end portion of the second punch have a flat front end surface and a flat side surface. As a result, the inner corner portion of the rectangular wave-shaped section becomes vertical, and a clean rectangular wave-shaped section can be bent.

According to a third aspect of the present invention, in the corrugated fin bending apparatus according to the first aspect, the first drive cam of the first punch unit and the second drive cam of the second punch unit are: The linear movement generated by the driving unit causes synchronous movement. In the third aspect, the first drive cam and the second drive cam are moved synchronously by the linear movement generated by the drive unit.

According to a fourth aspect of the invention, in the corrugated fin bending apparatus according to the third aspect, each of the first punches of the first punch unit slides along a cam surface of the first drive cam. The portion to be formed is a mountain-shaped inclined portion, and in each of the second punches of the second punch unit, the portion that slides along the cam surface of the second drive cam is a mountain-shaped inclined portion. In the fourth aspect, the first punch slides along the cam surface of the first drive cam, but has a mountain-shaped inclined portion. Similarly, in the second punch of the second punch unit, the portion that slides along the cam surface of the second drive cam is a mountain-shaped inclined portion. As a result, the sliding portion that is the sloped portion of the chevron becomes the sliding contact between the punch and the drive cam, and the first force can be reduced with a smaller force than when sliding over the entire surface.
The punch or the second punch can be pressed against the one surface side or the other surface side of the plate material against the biasing force of the biasing member.

According to a fifth aspect of the present invention, in the corrugated fin bending apparatus according to the first aspect, the bending is performed by each of the first punches of the first punch unit and each of the second punches of the second punch unit. From the corrugated fin having a rectangular wave-shaped cross-section formed by molding, the first punch and the second punch are retracted in the reverse order of the bending process, and the corrugated fin is held when the first punch and the second punch are separated from the corrugated fin. A holding member for doing so is provided in the first punch unit and the second punch unit. According to the fifth aspect, when the first punch and the second punch are retracted from the corrugated fin that has already been bent, they are retracted in the reverse order of the bending process. At this time,
By holding the corrugated fins on the holding member when the first punch and the second punch are separated from the corrugated fins, the corrugated fins can be prevented from being deformed.

According to a sixth aspect of the present invention, there is provided a corrugated fin bending method for bending a plate material into a corrugated fin having a rectangular wave-shaped cross section. The plate material is arranged between the punch unit and the second punch unit. A plurality of first punches arranged in a first punch group of the first punch unit, the first punch located on one end side of the first punch group to the first punch located on the other end side Is pressed against one side of the plate material in order against the urging force of the urging member by the operation of the first drive cam, and a plurality of second punches arranged in the second punch group of the second punch unit are arranged. And the second punch located on one end side of the second punch group to the second punch located on the other end side are sequentially operated by the operation of the second drive cam against the biasing force of the biasing member. On the plate Against the other surface side, a bending method of the corrugated fin, characterized in that for bending a sequential cross-sectional square wave-shaped portion from one end to the other end of the plate.

In the sixth aspect, the first punch unit is arranged on one surface side of the plate material. The second punch unit is arranged on the other surface side of the plate material. The first drive cam sequentially presses the first punch located on one end side of the first punch group to the first punch located on the other end side against one side of the plate material against the biasing force of the biasing member. . The second drive cam sequentially presses the second punch located on one end side of the second punch group to the second punch located on the other end side against the biasing force of the biasing member against the other surface side of the plate material. . The drive unit moves the first drive cam and the second drive cam to press the first punch of the first punch group against one side of the plate material and the second punch against the other surface side of the plate material. Then, the drive part sequentially bends the rectangular wave-shaped portion in cross section from one end side to the other end side of the plate material. As a result, the plate material, which is a raw material, can be bent into a corrugated fin having a rectangular wave cross section in one step.

According to a seventh aspect of the present invention, in the corrugated fin bending method according to the sixth aspect, the pressing end of the first punch pressed against one surface of the plate and the other surface of the plate. At the pressing end of the second punch that is pressed against, the flat tip surface and the side surface are perpendicular to each other. According to the seventh aspect of the present invention, the pressing end portion of the first punch and the pressing end portion of the second punch have a flat tip surface and a side surface which are perpendicular to each other. As a result, the inner corner portion of the rectangular wave-shaped section becomes vertical, and a clean rectangular wave-shaped section can be bent.

According to an eighth aspect of the present invention, in the corrugated fin bending method according to the sixth aspect, the first drive cam of the first punch unit and the second drive cam of the second punch unit are: The linear movement generated by the driving unit causes synchronous movement. In the eighth aspect, the first drive cam and the second drive cam are moved synchronously by the linear motion generated by the drive unit.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The embodiment described below is a preferred specific example of the present invention,
Although various technically preferable limitations are given, the scope of the present invention is not limited to these forms unless otherwise specified in the description below.

FIG. 1 shows an example of an electronic apparatus having a radiation fin bent by a corrugated fin bending apparatus of the present invention. This electronic device is a portable so-called notebook computer. Computer 1
Has a display unit 2 and a main body 3, and the display unit 2 has a main body 3
Is supported by the connecting portion 4 so as to be openable and closable. The main body 3 has a keyboard 5, a housing 12, a heat dissipation device 10, and the like.

FIG. 2 shows an example of a sectional structure taken along the line CC of FIG. In FIG. 2, a circuit board 20, a heat dissipation device 10, a heating element 15 and the like are housed in the internal space of the housing 12. The circuit board 20 is fixed in the housing 12, and the circuit board 20 has the heating element 15 mounted thereon.
The heating element 15 is, for example, a driver IC (integrated circuit), a CPU (central processing unit), or the like. These heating elements 1
5 generates heat during operation.

The heat dissipation device 10 has a heat conduction member 28, a heat sink 40, and a heat dissipation fan 30. The upper surface 16 of the heat generating element 15 is closely attached and fixed to one end of the heat conducting member 28. A heat sink 40 is thermally coupled to the other end of the heat conducting member 28. The heat sink 40 is made of a metal such as aluminum having excellent heat dissipation, and is used for heat dissipation.
Has 0.

In FIG. 2, the heating element 15 operates to generate heat. The generated heat is transmitted to the heat sink 40 through the heat conducting member 28. The corrugated fins 50 of the heat sink 40 radiate heat, but this heat is generated by the heat radiation fan 30 rotating.
It is discharged from one direction through the opening 13 of the housing 12 to the outside in the direction of F2. This corrugated fin 50 is shown in FIG.
By forming a thin plate of aluminum, for example, as shown in FIG.
And the valleys 51 and the peaks 52 are formed alternately and continuously. Inner corner portion 19 of the mountain portion 52 and the valley portion 51
0 is a right angle.

FIG. 4 shows a preferred embodiment of the corrugated fin bending apparatus, in which the plate material M is already arranged with respect to the corrugated fin bending apparatus 100. In FIG. 4, the corrugated fin bending apparatus 100 includes a corrugated fin 50 having a rectangular cross-section portion 60 as shown in FIG.
It is a device that bends in a process (or once). The corrugated fin bending apparatus 100 includes a first punch unit 70, a second punch unit 74, a drive unit 76, and a control unit 200. The corrugated fin bending apparatus 100 bends the corrugated fins 50 as shown in FIG. 3 by bending the plate material M. As the plate material M, for example, a thin plate excellent in heat dissipation such as aluminum is used. Can be used.

The first punch unit 70 has an upper punch group 80 as a first punch group, an upper punch drive cam 84 as a first drive cam, a cam rail 86 and a punch holding portion 88. The second punch unit 74 has a lower punch group 90 as a second punch group, a lower punch drive cam 94 as a second drive cam, a cam rail 96, and a punch holding portion 98. The first punch unit 70 is also called an upper punch unit, and the second punch unit 7
4 is also called the lower punch unit. The first punch unit 70 and the second punch unit 74 have a substantially symmetrical structure.

The drive unit 76 shown in FIG.
0 and a cam connecting plate 114. Actuator 1
10 operates according to a command from the control unit 200. A cam connecting plate 114 is attached to the rod 116 of the actuator 110. The upper end 118 of the cam connecting plate 114 is
It is fixed to the end of the upper punch drive cam 84. The lower end portion 120 of the cam connecting plate 114 is fixed to the end portion of the lower punch drive cam 94.

As a result, when the actuator 110 is operated, the cam connecting plate 114 causes the upper punch drive cam 84 and the lower punch drive cam 94 to move along the cam rails 86 and 96 at X1.
It can move in synchronization with the direction. Also actuator 1
As the 10 contracts, the upper punch drive cam 84
The lower punch drive cam 94 can move in synchronization with the cam rails 86 and 96 in the X2 direction. The cam rail 86 and the cam rail 96 are rails having, for example, a U-shaped cross section, and face each other with a space. As the actuator 110, for example, a hydraulic cylinder or a pneumatic cylinder can be adopted.

In FIG. 4, the punch holding portion 88 of the first punch unit 70 holds the upper punch group 80.
The punch holding portion 98 of the second punch unit 74 holds the lower punch group 90. Upper punch group 80 and lower punch group 9
The plate material M, which is a material, is positioned between zero. Accordingly, the first punch unit 70 is located on the one surface side 130 side of the plate material M, and the second punch unit 74 is on the other surface side 1 of the plate material M.
It is located on the 31st side. Upper punch group 8 as shown in FIG.
0 has a plurality of first punches 140. Similarly, the lower punch group 90 has a plurality of second punches 150. The first punch 140 is also called an upper punch, and the second punch 150 is also called a lower punch. The punch holding unit 88 accommodates and holds the plurality of first punches 140, and the punch holding unit 98 accommodates and holds the plurality of second punches 150.

FIG. 5 shows the upper punch group 80 and the punch holding section 8.
It is a perspective view showing 8 grade. FIG. 6 is a perspective view showing the lower punch group 90 and the punch holding portion 98. The punch holding unit 88 shown in FIG. 5 holds a plurality of first punches 140, and each first punch 140 is a thin plate-shaped member. The first punches 140 are closely arranged in parallel with each other. The plurality of first punches 140 has a punch holding section 88.
Are housed in the space surrounded by the two side plates 88A and 88B,
The punch 140 can be slid separately in the Z1 direction and the Z2 direction. Two side plates 88A, 88
A is facing each other, and two side plates 88B, 88
B is also facing. The two facing side plates 88A of the punch holding portion 88 are provided on the lower surface side of the cam rail 86 in a Z direction.
It is fixed so as to project in one direction.

Each first punch 140 is fixed to one end 160A of a coil spring 160 as a biasing member. Although not shown, the other end of the coil spring 160 is fixed to the cam rail 96 side. Accordingly, each first punch 140 can independently protrude in the Z1 direction in the punch holding portion 88 against the biasing force of the coil spring 160. The first punch 140 has a pressing end 170 and a sliding contact 171. The pressing end 170 is provided on the lower end side of each first punch 140, and the sliding contact 171 is provided on the upper end side of the first punch 140.

The pressing end 170 has a flat tip surface 17
It has two and two side surfaces 173. Flat tip surface 17
The two and the two side surfaces 173 are formed so as to be at right angles. The pressing end 170 has the first punch 14
It is made thinner than the wall thickness of 0, and each pressing end 1
A parallel gap 214 is formed between the 70. The sliding contact 171 has a substantially chevron shape. The sliding contact point 171 is slid on the cam surface of the cam rail 86 described later.

Next, referring to FIG. 6, the punch holding portion 9
8 has two side plates 98A and two side plates 98B. The two side plates 98A face each other, and similarly the two side plates 98B.
Are also facing each other. One end of the side plate 98A is fixed to the end of the cam rail 96. The plurality of second punches 150 can linearly move in the Z1 direction or the Z2 direction within the punch holding unit 98.

Each second punch 150 is connected to one end 190A of a coil spring 190 as a biasing member. The other end of the coil spring 190 is fixed to the cam rail 96 (not shown). As a result, each second punch 150 is
It is possible to move independently in the Z2 direction against the biasing force of the coil spring 190.

Each second punch 150 has a pressing end portion 18
0 and a sliding contact 181. Pushing end 180
Is a flat tip surface 1 similar to the pressing end 170 of FIG.
82 and two side surfaces 183. Flat tip surface 1
82 and the two side surfaces 183 are formed so as to form a right angle. A gap 2 is formed between the adjacent pressing ends 180.
24 are formed and adjacent pressing ends 180 are parallel. The sliding contact 181 is formed in a substantially chevron shape, and the sliding contact 181 has a cam rail 9 described later.
6 is a portion which is slid on the cam surface.

In FIG. 5, two upper ejector plates 210 are provided on the first punch unit 70. As shown in FIG. 6, the lower ejector plate 220
Are provided in the second punch unit 74. The upper ejector plate 210 of FIG. 5 is a plate-shaped member having a comb-teeth shape, and includes two upper ejector plates 210.
Are provided at intervals and in a direction orthogonal to the direction of the first punch 140. Similarly, 2 in FIG.
The lower ejector plates 220 are plate-shaped and have a comb-tooth shape, and the two lower ejector plates 220 are provided at intervals and in a direction perpendicular to the direction of the second punch 150. There is.

FIG. 7 is a view showing a structural example of the first punch unit 70 and the second punch unit 74. Between the first punch unit 70 and the second punch unit 74, a plate material which is a processing material has not been arranged yet. As described above, the first punch unit 70 has the upper punch group 80 and the upper ejector plate 210. The second punch unit 74 has a lower punch group 90 and a lower ejector plate 220.

In FIG. 8, the plate material M is the first punch unit 7
It is arranged between 0 and the second punch unit 74, and shows a state in which bending of the plate material M is started.
FIG. 9 shows a state in which the corrugated fins 50 are formed by bending the plate material M of FIG. As shown in FIG. 9, after the corrugated fins 50 are formed, the first punch 140 and the second punch 150 are removed.
The upper ejector plate 210 and the lower ejector plate 220 have a function of preventing the corrugated fins 50 from being deformed by holding the corrugated fins 50 when they are separated from each other. That is, the upper ejector plate 210 and the lower ejector plate 220 correspond to holding members for holding the shape of the corrugated fins when the first punch and the second punch are separated from the corrugated fins 50.

In this way, the upper ejector plate 210
The lower ejector plate 220 has the following structure in order to exert the function of retaining the shape of the completed corrugated fin 50. 5 and 7
As shown in FIG. 3, the upper ejector plate 210 has a flat main body portion 211 and a comb tooth-shaped portion 212. Similarly, as shown in FIGS. 6 and 7, the lower ejector plate 220 also has a flat main body portion 221 and a comb tooth-shaped portion 222.

The main body portion 211 is integral with the comb tooth-like portion 212, and the main body portion 221 is integral with the comb end-like portion 222. The comb-teeth portion 212 has a plurality of protrusions 213, and the comb-teeth portion 222 has a plurality of protrusions 223.
The protrusions 213 are formed at regular intervals so as to project in the Z1 direction. The protrusions 223 are formed at equal intervals in parallel and project in the Z2 direction. As shown in FIG. 9, the number of the protrusions 213 and the protrusions 223 is matched with the number of rectangular wave-shaped portions of the corrugated fin 50. As shown in FIG. 5, the protrusion 213 is arranged so as to protrude in the Z1 direction from the gap 214 of the first punch 140.
Similarly, as shown in FIG. 6, the protrusions 223 are arranged in the Z2 direction so as to project from the gap 224 of the second punch 150. The arrangement direction of the protrusions 213 in FIG. 5 is a direction orthogonal to the longitudinal direction of the first punch 140. Similarly, in FIG. 6, the arrangement direction of the protrusions 223 is a direction orthogonal to the longitudinal direction of the second punch 150.

In FIG. 5, each upper ejector plate 2
10 is a guide groove 14 formed in each first punch 140.
9 is guided in the directions Z1 and Z2. Similarly, the lower ejector plates 220 of FIG. 6 are guided by Z1 and Z2 along the guide grooves 159 formed in the second punch 150, respectively.

The first punch unit 70 and the second punch unit 70 shown in FIG.
The punch unit 74 can be made of metal such as iron. Among them, the first punch 140 and the second punch 150 can be made by, for example, heat treating carbon tool steel. The upper ejector plate 210 and the lower ejector plate 220 shown in FIGS. 5 and 6 can be made by heat treating carbon tool steel, for example.

By operating the actuator 110 shown in FIG. 4, the upper punch drive cam 84 and the lower punch drive cam 9 are driven.
4 is synchronously movable along the X1 or X2 direction. Next, the upper punch drive cam 84 and the lower punch drive cam 94 will be described. FIG. 10 shows a timing example of the upper punch drive cam 84 and the lower punch drive cam 94. As shown in FIG. 11, the upper punch drive cam 84 has a function of sequentially pushing down each first punch 140 of the upper punch group 80 in the Z1 direction from one side to the other side. As shown in FIG. 12, the lower punch drive cam 94 in FIG. 10 has a function of sequentially pushing up each second punch 150 of the lower punch group 90 in the Z2 direction from one side to the other side.

As shown in FIGS. 10 and 11, the upper punch drive cam 84 includes an inclined cam surface 84A, a flat cam surface 84B, an inclined cam surface 84C, a flat cam surface 84D, and an inclined cam surface 84.
E, the flat cam surface 84F, the slant cam surface 84G, the flat cam surface 84H, the slant cam surface 84I, and the flat cam surface 84J are formed alternately with the slant cam surface and the flat cam surface. Similarly, the lower punch drive cam 94 includes the inclined cam surface 94A, the flat cam surface 94B, the inclined cam surface 94C, the flat cam surface 94D, the inclined cam surface 94E, the flat cam surface 94F, the inclined cam surface 94G, and the flat cam surface 94H. , Inclined cam surface 94
I, has a flat cam surface 94J.

The upper punch drive cam 84 and the lower punch drive cam 94 in FIG. 10 move in the X1 and X2 directions in synchronization with each other, but the inclined cam surface 84A and the inclined cam surface 94A are displaced by one pitch P. There is. As shown in FIG. 11, the first punch 1 is formed on the inclined cam surface 84A and the flat cam surface 84B.
Forty sliding contacts 171 are slid. Similarly, FIG.
As shown in FIG. 5, the sliding contacts 181 of the second punch 150 are slid on the inclined cam surface 94A, the flat cam surface 94B and the like. By using the chevron-shaped sliding contacts 171 and 181, as described above, the first punch 14 can be used as compared with a flat sliding surface.
0 and the sliding resistance between the upper punch drive cam 84 and the sliding resistance between the second punch 150 and the lower punch drive cam 94 shown in FIG. 12 can be reduced, and the first punch 140 and the second punch 150 move. Can be done more easily.

Next, a method of bending the plate material M will be described with reference to FIGS. 13, 14 and 4. 13 (A), (B) and (C) and FIG. 14 (D),
(E) and (F) show an example of a procedure for bending the plate material M into a corrugated fin having a rectangular wave cross section as shown in FIG. In FIG. 13A, the upper punch group 8
The plate material M is inserted between 0 and the lower punch group 90. The plate material M is arranged at a position close to the pressing end portion 170 of the upper punch group 80. Each first punch 140 of the upper punch group 80 shown in FIG. 5 is pressed against the cam rail 86 side by the coil spring 160. Similarly, each second punch 150 of the lower punch group 90 in FIG. 6 is pressed against the cam rail 96 side by the coil spring 190. As shown in FIG. 10, the upper punch drive cams 84 have the inclined cam surfaces 8 corresponding to the number of the first punches.
4A, the lower punch drive cam 94 also has an inclined cam surface of the number corresponding to the number of the second punches.

Next, when the drive unit 96 of FIG. 4 operates the actuator 110, the cam connecting plate 114 moves in the X1 direction, so that the upper punch drive cam 84 and the lower punch drive cam 94 move in synchronization with the X1 direction. To do. When the upper punch drive cam 84 and the lower punch drive cam 94 in FIG. 10 start moving in the X1 direction, the first punch 140 of the upper punch group 80 moves from one end side 80R to the other end side 8 as shown in FIGS.
While being pushed down in the Z1 direction in sequence over 0T,
Each second punch of the lower punch group 90 is sequentially pushed up toward the one end side 90R or the other end side 90T.

When bending is started as shown in FIG. 13,
As shown in FIGS. 7 to 8, the upper ejector plate 21
The protrusion portion 213 of 0 descends in the Z1 direction from the gap of the first punch 140 to a state of slightly protruding from the first punch 140. Similarly, each of the protrusions 223 of the lower ejector plate 220 also moves from the gap between the second punches 150 to the second punches 1.
Ascend slightly above 50 and go up in the Z2 direction. The movement of the upper ejector plate 210 in the Z1 direction and the movement of the lower ejector plate 220 in the Z2 direction are performed by an actuator (not shown). In this way, each protrusion 2
13 and 223 have moved to positions projecting from the first punch 140 and the second punch 150, respectively, and even after the bending process of the plate material M is completed, the protrusions 213 and 223 have the protrusions 213 and 223 at the rightmost position. It stays in that position until 140-1 shown in FIG. 8 returns in the Z2 direction.

First, as shown in FIG. 13A, the second punch 150-1 on the rightmost side of the lower punch group 90 is previously moved to Z by the operation of an actuator (not shown).
It rises in one direction and approaches the other surface side 131 of the plate material M. Figure 1
As shown in FIG. 3 (B), the rightmost first punch 140-1 of the upper punch group 80 is lowered in the Z1 direction by operating an actuator (not shown) in advance. As a result, the plate material M becomes the second punch 150-1 and the first punch 140.
It is sandwiched by -1.

Next, the actuator 110 shown in FIG. 4 is actuated, and the upper punch drive cam 84 and the lower punch drive cam 94 are moved to the X position.
When moving in one direction, as shown in FIG.
The first punch 1 in order from the punch 140-2 in the Y1 direction.
The first punch and the second punch are sequentially pressed against the plate material M in the same manner as 40-2 and the second punch 150-2. As shown in FIG. 14D, the second punch 150-2
As the pressure rises, as shown in FIG. 14 (E), the first punch 1
40-3 to the first punch 140-15 and the second punch 1
Alternate plate material M from 50-3 to second punch 150-14
Pressed against. As a result, FIG. 14 (E)
As shown in, the corrugated fin 50 having a rectangular wave cross section can be formed by one bending step.

After the corrugated fins 50 are formed in this way, the actuator 110 shown in FIG. 4 contracts to move the upper punch drive cam 84 and the lower punch drive cam 94 back in the X2 direction. As a result,
4 (E) and the first punch 140-15 shown in FIG. 14 (F).
To 140-2 are lifted in the Z2 direction in the reverse order of the bending process, and the second punch 150-14
To 150-1 are also returned in the Z1 direction in the reverse order of the bending process. In this way, the first punch and the second punch can be returned in the Z2 and Z1 directions, respectively, because of the biasing forces of the coil springs 160 and the coil springs 190 shown in FIGS.

FIG. 9 shows a state in which the first punch moves up to Z2, the second punch moves down in the Z1 direction, and the first punch and the second punch are separated from the corrugated fin 50. When the punch is separated, the upper ejector plate 210 and the lower ejector plate 220 are in a protruding state, and the upper ejector plate 2
The protrusion 213 of 10 abuts on the upper end surface of the rectangular wave-shaped section 60 of the corrugated fin 50, and the other protrusion 223 also abuts the rectangular wave-shaped section 60. Therefore, even when the first punch and the second punch are separated from the corrugated fin 50 in the Z2 and Z1 directions, the rectangular wave-shaped portion 60 of the corrugated fin 50 in cross section is formed.
Since it is held by the projections 213 and 223, the shape of the corrugated fin 50 does not collapse or deform.

Then, after the first punch 140-1 shown in FIG. 9 is lifted in the Z2 direction, the second punch 150-1 is moved to the Z direction.
When lifted in two directions, the corrugated fin 50
By sliding in the direction perpendicular to the paper surface of FIG. 9, the first
It can be taken out from the punch unit 70 and the second punch unit 74. In this way, the corrugated fin 50 having the rectangular wave-shaped section 60 can be bent from the plate material.

The first punch 140 shown in FIGS. 5 and 6 is used.
The pressing end portion 170 of the second punch 150 and the pressing end portion 180 of the second punch 150 have two flat side surfaces 1 and two side surfaces 1 perpendicular to each other.
As shown in FIG. 3, the inner corner portion 1 of the rectangular corrugated portion 60 of the corrugated fin 50 has a portion 73.
90 can be right angle or vertical, and the rectangular wave-shaped section 60 has a right-angled inner angle section 1 with a correct pitch PT.
90 can be formed.

In the embodiment of the present invention, the adjacent upper punch drive cam 84 and lower punch drive cam 94 are interlocked,
By driving the first punch and the second punch, it is possible to sequentially form the rectangular wave-shaped section 60 from one end to the other end of the plate material M in one step or one bending step. The orientations of the first punch and the second punch can be controlled by optimally setting the positions of the inclined cam surface of the upper punch drive cam 84 and the inclined cam surface of the lower punch drive cam 94 shown in FIG. While the first punch is driven in the Z1 direction by the inclined cam surface, the second punch slides on the flat cam surface of the lower punch drive cam 94, and therefore is not driven in the Z2 direction. Further, when the first punch slides on the flat cam surface of the upper punch drive cam 84, the second punch starts moving up in the inclined cam surface of the lower punch drive cam 94 and starts to move in the Z2 direction. By alternately operating the first punch and the second punch in this manner and repeating them, it is possible to sequentially form the rectangular wave-shaped section in the section from the one end to the other end of the plate material M.

The present invention is not limited to the above embodiment. The number of first punches and the number of second punches are not limited to those in the illustrated embodiment, but can be set according to the number of rectangular wave-shaped portions in cross section to be formed. In the above-described embodiment, it has been described that the rightmost second punch 150-1 of the lower punch group 90 and the rightmost first punch 140-1 of the upper punch group 80 are operated by an actuator (not shown). However, if the shapes of the upper punch drive cam 84 and the lower punch drive cam 94 are configured as shown in FIG. 15, the actuator 110 of FIG.
Bending can be performed only by the operation of. 15, when the upper punch drive cam 84 and the lower punch drive cam 94 are driven in the X1 direction by the actuator 110 of FIG. 4, first, the inclined right cam surface 940 is used to drive the second rightmost punch of the lower punch group 90 of FIG. 150-1 rises. Next, using the inclined cam surface 840 of FIG. 15, the upper punch group 80 of FIG.
The rightmost first punch 140-1 descends. Subsequently, the second cam punch 140-2 from the right of the upper punch group 80 is lowered by the inclined cam surface 84A. After that, the upper punch and the lower punch will descend and rise in sequence as described above. As described above, the rectangular corrugated fin 50 can be formed by one bending step.

[0052]

As described above, according to the present invention,
The plate material can be bent into a corrugated fin having a rectangular wave cross section in one step.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of an electronic device having a corrugated fin made by a corrugated fin bending apparatus of the present invention.

FIG. 2 is a cross-sectional view taken along line CC of the electronic device of FIG.

FIG. 3 is a perspective view showing a shape example of a corrugated fin.

FIG. 4 is a perspective view showing an embodiment of a corrugated fin bending apparatus.

FIG. 5 is a partially cutaway perspective view showing a first punch unit.

FIG. 6 is a partially cutaway perspective view showing a second punch unit.

FIG. 7 is a view showing a structure of a first punch unit and a second punch unit.

FIG. 8 is a view showing a state in which a plate member is arranged between the first punch unit and the second punch unit and bending processing is started.

FIG. 9 is a view showing a state in which the first punch and the second punch are separated from the corrugated fin after the plate material is bent to form the corrugated fin.

FIG. 10 is a diagram showing an upper punch drive cam and a lower punch drive cam.

FIG. 11 is a perspective view showing an upper punch drive cam and a first punch.

FIG. 12 is a perspective view showing a lower punch drive cam and a second punch.

FIG. 13 is a view showing a state in which bending work is started.

FIG. 14 is a view showing a state in which a corrugated fin is formed by accommodating a bending process.

FIG. 15 is a diagram showing another embodiment of the present invention.

FIG. 16 is a view showing a conventional corrugated fin processing apparatus.

[Explanation of symbols]

50 ... Corrugated fins, 60 ... Rectangular wave-shaped section, 70 ... First punch unit (also called upper punch unit), 74 ... Second punch unit (also called lower punch unit), 76 ... Drive unit, 80 ...
Upper punch group (first punch group), 84 ... upper punch drive cam (first drive cam), 86, 96 ... cam rail, 90 ... lower punch group (second punch group), 94.・
-Lower punch drive cam (second drive cam), 100 ... Corrugated fin bending device, 130 ... One side of plate material, 131 ... Other surface side of plate material, 140 ... First punch (Upper punch), 150 ... second punch (lower punch), 160,190 ... coil spring (biasing member), 170,180 ... pressing end, M ...
Plate material

Claims (8)

[Claims] 1. A corrugating fin bending apparatus for bending a plate into a corrugated fin having a rectangular wave cross section, wherein a first punch unit disposed on one side of the plate and the other side of the plate are provided. A second punch unit disposed on the side, the first punch unit includes a first punch group having a plurality of arranged first punches, and
A first drive cam for sequentially pressing the first punch of the first punch group against one side of the plate material against the biasing force of a biasing member, and the second punch unit, A second punch group having a plurality of arranged second punches;
A second drive cam for sequentially pressing the second punch of the second punch group against the urging force of the urging member against the other surface side of the plate material, and further including the first drive cam. By moving the second drive cam, the first punch of the first punch group is pressed against one surface side of the plate material, and the second punch is pressed against the other surface side of the plate material. A corrugated fin bending apparatus, comprising: a drive unit that sequentially bends a rectangular wave-shaped portion in cross section from one end side to the other end side. 2. The pressing end of the first punch that is pressed against one surface of the plate material and the pressing end of the second punch that is pressed against the other surface of the plate have flat tip surfaces. The corrugated fin bending apparatus according to claim 1, wherein the side surface is vertical. 3. The first driving cam of the first punch unit and the second driving cam of the second punch unit are synchronously moved by a linear motion generated by the driving unit. The corrugated fin bending apparatus described. 4. A portion of each of the first punches of the first punch unit that slides along the cam surface of the first drive cam is a mountain-shaped inclined portion, and each of the second punch units of the first punch unit includes: The corrugated fin bending apparatus according to claim 3, wherein a portion of the second punch that slides along the cam surface of the second drive cam is a mountain-shaped inclined portion. 5. A corrugated fin having a rectangular wave cross section formed by being bent by each of the first punches of the first punch unit and each of the second punches of the second punch unit. A holding member for holding the corrugated fins when retracting the first punches and the second punches in the reverse order and separating them from the corrugated fins includes the first punch unit and the second punch unit.
The corrugated fin bending apparatus according to claim 1, which is provided in the punch unit. 6. A corrugated fin bending method for bending a plate material into a corrugated fin having a rectangular wave cross section, wherein the plate material is arranged between the punch unit and the second punch unit, and the first punch is provided. A plurality of first punches arranged in a first punch group of the unit, from the first punch located on one end side of the first punch group to the first punch located on the other end side, a first drive cam The second punch unit is pressed against one side of the plate material in order against the urging force of the urging member and arranged in the second punch group of the second punch unit. From the second punch located on one end side of the two punch group to the second punch located on the other end side, the operation of the second drive cam resists the urging force of the urging member to sequentially remove the other plate materials. Push in the direction Put, the bending method of the corrugated fin, characterized in that for bending a sequential cross-sectional square wave-shaped portion from one end to the other end of the plate. 7. A flat tip surface is provided at a pressing end portion of the first punch pressed against one surface side of the plate material and a pressing end portion of the second punch pressed against the other surface side of the plate material. The method for bending a corrugated fin according to claim 6, wherein the side surface is vertical. 8. The method according to claim 6, wherein the first drive cam of the first punch unit and the second drive cam of the second punch unit are synchronously moved by a linear motion generated by the drive unit. A method for bending a corrugated fin as described.