JPH10166090A - Producing die of fin for heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a producing die of a fin for a heat exchanger which forms a spacing tab of a prescribed height in one process. SOLUTION: This producing die of a heat exchanger fin is composed so that the heat exchanger fin stood with a spacing tab is formed to laminate plural numbers of the heat transfer fins formed with through holes to pierce a heat transfer tube through a prescribed clearance with the spacing tab. In this case, on an upper die 28 and a lower die 30 composing a producing die, a punch 33 and a die hole 24 to break through a prescribed place of a metal for forming the heat exchanger fin are installed, and in a time of closing the upper die 28 and the lower die 30, inserting the top end of the punch 33 to the die hole 24 and forming the spacing tab, an end face of a level pin 25 to bend the top end of the formed spacing tab and to make it to a prescribed height is positioned inside the die hole 24.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold for manufacturing fins for a heat exchanger, and more particularly, to a plurality of fins for a heat exchanger having through holes formed therein through which a heat exchange tube is inserted. The present invention relates to a mold for manufacturing a fin for a heat exchanger, which forms a fin for a heat exchanger on which the spacing tabs are erected so that the fins can be stacked through a gap.

[0002]

2. Description of the Related Art As a heat exchanger used for a radiator of an automobile, a fin for a heat exchanger in which a plurality of through holes with a collar shown in FIG. 7 are formed in a strip-shaped metal plate is used. The collar-equipped through-hole has an elliptical through-hole 102 through which a heat exchange tube formed in a metal plate 100 is inserted, and two collars 104, 104 standing upright along the long axis of the through-hole 102. I have. The collars 104, 104
The cross-sectional shape of the heat exchange tube inserted into the heat exchanger tube 02 is in contact with the side surface of the heat exchange tube having an elliptical shape to improve heat exchange efficiency. Furthermore, pico (spacing tabs) 106, 106 are erected near the collared through holes. The picos 106 are used to secure a predetermined gap between the heat exchanger fins when a plurality of heat exchanger fins are stacked, and are formed by cutting and raising a predetermined portion of the metal plate 100. doing. For this reason, in the heat exchanger fin having the through holes with collars shown in FIG. 7, when the gap between the heat exchanger fins is changed, the pico 106, 106
In order to change the height of the tool, it is necessary to change a machine tool such as a punch mounted on a manufacturing die for forming the pico 106, 106.

As described above, it is extremely difficult to change a machine tool such as a punch mounted on a manufacturing mold, and this is one of the causes of lowering the manufacturing efficiency of heat exchanger fins. Attempts have been made to use heat exchanger fins in which spacing tabs 10, 10 are formed in the vicinity of collared through holes. The spacing tabs 10, 10 are
Is formed by subjecting a predetermined portion to a piercing process (hereinafter, sometimes referred to as a lance process). As shown in FIG. 10, the height of the spacing tabs 10, 10 is adjusted by bending the leading ends thereof. For this reason, the spacing tabs 10, 10, whose bent ends are bent.
.. Heat exchanger fins 12, 12,... Formed with
Are stacked at predetermined intervals secured by the spacing tabs 10, 10,... Of which heights have been adjusted, as shown in FIG.

[0004]

According to the spacing tab 10 shown in FIG. 9, even if the gap between the heat exchanger fins 12 is changed, the bending amount of the tip of the spacing tab 10 is adjusted to increase the height. Adjustment is possible. For this reason, it is not necessary to change a machine tool such as a punch mounted on a manufacturing die for forming the spacing tab 10. However, the forming of the spacing tab 10 shown in FIG. 9 is usually performed by bending the tip of the spacing tab 10 after bending the spacing tab 10 on the metal plate 100 by lance processing. As described above, since the spacing tab 10 is formed in two steps, the mold for manufacturing the heat exchanger fins tends to be large. Therefore, an object of the present invention is to provide a mold for manufacturing a heat exchanger fin that can form a spacing tab having a predetermined height in one step.

[0005]

Means for Solving the Problems As a result of repeated studies to solve the above-mentioned problems, the present inventors have used a pair of dies having a punch and a die hole for forming a spacing tab, and having a punch. The inventors have found that a spacing tab having a predetermined height can be formed in one step if the tip of the formed spacing tab can be bent in the die hole that is inserted to form the spacing tab, and the present invention has been achieved. That is, in the present invention, the spacing tab is provided upright so that a plurality of heat exchanger fins each having a through hole through which the heat exchange tube is inserted can be stacked with a predetermined gap by the spacing tab. A heat exchanger fin manufacturing mold forming the heat exchanger fins, comprising the manufacturing mold,
A pair of dies, one of which is provided so as to be able to freely move toward and away from the other, has a fin formed by piercing a predetermined portion of the heat exchanger fin or the metal band for forming the heat exchanger fin. When a punch and a die hole forming a pacing tab are provided, and the pair of molds are closed, when the punch is inserted into the die hole to form a spacing tab,
Height adjusting means for bending the leading end portion of the formed spacing tab to a predetermined height is provided in the mold, the mold for manufacturing a fin for a heat exchanger is provided.

In the present invention, by providing an adjusting member for adjusting the position of the abutting end of the height adjusting means abutting on the leading end of the spacing tab in the mold, the heat exchange having different spacing tab heights is provided. Dexterous fins can be easily formed. Further, when the pair of dies are opened, the pressing end of the height adjusting unit is pushed out of the die contacting surface so as to push the spacing tab out of the die hole. By providing the means in the mold, the heat exchanger fin having the spacing tab formed thereon can be easily sent to the next step. As such a height adjusting means of the present invention, a level pin that bends when the tip of the formed spacing tab abuts on one end face is used, and the tip of the spacing tab formed by the punch entering the die hole. By mounting the level pin in the mold with one end inserted into this die hole so that it can abut,
A height-adjusted spacing tab can be easily formed in one step.

According to the manufacturing mold of the present invention, when the pair of molds is closed, the die and the punch are used to break through a predetermined portion of the heat exchanger fin or the metal band for forming the heat exchanger fin. In addition to forming the spacing tab, the tip of the formed spacing tab can be bent by the height adjusting means provided on the mold to make the spacing tab a predetermined height. For this reason, the tip part is bent in the heat exchanger fin or the metal strip for forming the heat exchanger fin, so that a spacing tab having a predetermined height can be formed in one step.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail with reference to the drawings. FIG. 1 is a partial cross-sectional view showing an example of a manufacturing die according to the present invention. The manufacturing mold shown in FIG. 1 is a pair of molds composed of an upper mold 20 and a lower mold 40,
0 is provided so as to be movable toward and away from the lower mold. The upper die 20 has a die 23 mounted on a die holder 22 provided on an upper die set 21. This die 2
3 is urged in the direction of the tapered jib 27 by a spring 26 as an urging member.
Is in contact with the tapered jib 27. The tapered jib 27 is composed of inclined plates 28 and 29 having inclined surfaces formed in a direction perpendicular to the drawing and in sliding contact with each other.
9 is in contact with the upper die set 21 or the other end surface of the level pin 25. Therefore, the position of one end surface of the level pin 25 in the die hole 24 can be changed by moving one of the inclined plates 27 and 28 in the direction perpendicular to the drawing.

The lower die 30 used as a pair with the upper die 20 is provided with a punch 33 standing upright on a punch holder 32 provided on a lower die set 31, and a tip of the punch 33 is provided with a stripper 34. Into the hole 35 formed in the hole. The stripper 34 is urged in the direction of the upper die 20 along a stripper guide 37 provided on the lower die set 31 by a spring 36 as an urging member provided on the lower die set 31. At the same time, the upper limit position is regulated by the stripper guide 37. As shown in FIGS. 2A and 2B, the punch 33 provided on the lower die 30 has a pointed tip and a flat tongue-shaped tip 33a that is narrower than the punch body 33b. The tip portion 33a and the punch body 33b are integrally formed via an inclined portion 33c having a slope inclined from the rear end of the tip portion 33a toward the upper end of the punch body 33b. Have been. As shown in FIGS. 2A and 2B, one end of a level pin 25 inserted into a die hole 24 formed in a die 23 provided with the upper die 20 is provided.
When the upper mold 20 and the lower mold 30 are closed, the punch 33 is closed.
Is provided with a U-shaped concave portion 25a into which the distal end portion 33a is inserted. The peripheral end surface of the concave portion 25a is a contact surface that comes into contact with the distal end of the spacing tab 10 formed in the die hole 24.

FIG. 1 shows an upper mold 20 and a lower mold 30 constituting a pair of molds in an open state. After the metal plate 100 is placed on the stripper 34 of the lower mold 30, the upper mold 20 is closed. Is lowered in the direction of the lower mold 30 to close the mold, whereby the spacing tab 10 can be formed on the metal plate 100. At the time of closing the mold, the die mold 23 in which the upper mold 20 descends and comes in contact with the stripper 34 descends and presses the stripper 34 against the urging force of the spring 36. For this reason, as shown in FIG. 2A, the tip 33 a of the punch 33 protrudes from the upper surface of the stripper 34 and has a U-shape formed at one end of the level pin 25 inserted into the die hole 24. In the recess 25a. The tip 3 of the punch 33
3a, lance processing is performed on the metal plate 100 placed on the stripper 34, and the metal plate 100
The spacing tab 10 is formed at a predetermined location. At the time of this lance processing, the spacing tab 10 holds the punch 3
3 is formed along the inclined surface of the inclined portion 33c forming the third portion, so that the cross-sectional shape becomes a "<" shape. Further, when the upper die 20 descends and the die die 23 presses the stripper 34, and the tip 33 a of the punch 33 is further inserted into the die hole 24, along the inclined surface of the inclined portion 33 c of the punch 33. The raised tip of the spacing tab 10 abuts on one end surface of the level pin 25 as shown in FIG. The upper die 20 in a state where one end face of the level pin 25 is in contact with the tip of the spacing tab 10, is bent downward at the one end face of the level pin 25 at the tip of the spacing tab 10 caused by the punch 33. Descent to the point position.

The upper mold 20 which has descended to the bottom dead center position is inverted to ascend. When the upper die 20 starts to rise, the stripper 34 also rises with the rise of the upper die 20, and near the top dead center of the upper die 20, the punch 33 pulled out from the die hole 24.
As shown in FIG. 1, the tip 33a of the
Is stored in the hole 35 formed in the hole. Therefore, the metal plate 100 mounted on the stripper 34 and having the spacing tab 10 formed thereon can be moved to the next step. In the manufacturing mold shown in FIGS.
To change the height of the spacing tab 10 formed at zero, one of the inclined plates 28 and 29 constituting the tapered jib 27 is moved in a direction perpendicular to the drawing, and the level pin 25 is moved in the die hole 24 at one end surface thereof. It can be easily handled by changing the position.

In the manufacturing mold shown in FIGS. 1 and 2, one end face of the level pin 25 is always located in the die hole 24. Therefore, when the mold is opened, the slot formed in the die hole 24 is formed. The operation of pushing the pacing tab 10 out of the die hole 24 is not performed. Even without such an operation, usually, the formed spacing tab 10 does not adhere to the inner wall surface of the die hole 24, so that when the mold is opened, the spacing tab 10 moves out of the die hole 24. You can get out.
However, when the mold is opened, the formed spacing tab 1
When there is a possibility that 0 may be inserted into the die hole 24, it is preferable to use the manufacturing mold shown in FIG. In the manufacturing die shown in FIG. 3, the same parts as those in the manufacturing die shown in FIGS. 1 and 2 are given the same reference numerals as those in FIGS. 1 and 2, and detailed description is omitted.

When the upper mold 20 and the lower mold 30 are opened, one end of the level pin 25 is connected to the upper mold 20.
And forcibly pushes the formed spacing tab 10 out of the die hole 24. In the manufacturing mold shown in FIG. 3, a knockout plate 41 is provided between the tapered jib 27 and the die holder 22 with a gap 40 interposed therebetween. This knockout plate 4
1 is urged in the direction of the die holder 22 by a spring 42 as an urging member.
When the mold is opened, one surface of the knockout plate 41 comes into contact with the other end surface of the level pin 25 and the level pin 2
One end of 5 protrudes from the contact surface of upper mold 20. Furthermore,
The knockout plate 41 is provided on the die holder 22, and one end of the knockout plate 41 is also in contact with the other end surface of the butting pin 43 protruding from the contact surface of the upper die 20.

On the other hand, the lower die 30 is provided with a spring 44 as an urging member provided in a concave portion 47 formed in the lower die set 31 at a position facing the butting pin 43 of the upper die 20. , Killer pin 4 urged in the direction of upper mold 20
6 are provided. One end of the killer pin 46 is located in a through hole 48 that passes through the stripper 34 when the upper mold 20 and the lower mold 30 are opened. Further, the urging force of the spring 44 for urging the killer pin 46 is larger than the urging force of the spring 42 for urging the knockout plate 41 downward so as to push the knockout plate 41 in the direction of the tapered jib 2 when the mold is opened. Adjust to be larger. The adjustment of the urging force of the spring 44 can be performed by a screw plug 49 screwed into the entrance of the recess 47.

When the metal plate 100 is placed on the stripper 34 of the manufacturing die shown in FIG. 3 and the die is closed, the upper die 20 descends in the direction of the lower die 30 and contacts the die die 23. The contacting stripper 34 is lowered. At this time, as shown in FIG. 4, one end of the butting pin 43 and one end of the killer pin 46 are in contact with each other, and the knockout plate 41 that is in contact with the other end of the butting pin 43 is moved with the lowering of the upper die 20. Spring 4
2 is pushed upward until it comes into contact with the tapered jib 27 against the urging force of No. 2. Therefore, a gap 40 is formed between the knockout plate 41 and the die holder 22, and the spring 2
6, one end of the level pin 25 urged in the direction of the taper jib 27 is connected to the die hole 2 as shown in FIG.
It is drawn into 4.

As described above, when the tip 33a of the punch 33 provided in the lower die 30 is inserted into the die hole 24 into which the one end of the level pin 25 is pulled, the inclination of the inclined portion 33c of the punch 33 is increased. The tip of the spacing tab 10 raised along the surface comes into contact with one end surface of the level pin 25 as shown in FIG. The upper die 20 in a state where one end face of the level pin 25 is in contact with the tip of the spacing tab 10, is bent downward at the one end face of the level pin 25 at the tip of the spacing tab 10 caused by the punch 33. Descent to the point position. Next, the upper mold 20 having descended to the bottom dead center position is inverted to ascend. As shown in FIG. 4, the contact between one end of the abutment pin 43 and one end of the killer pin 46 is released near the top dead center of the upper mold 20 and the knockout plate 41 is Presses the level pin 25 downward. For this reason, as shown in FIG. 5B, one end surface of the level pin 25 protrudes from the contact surface of the upper die 20, and forcibly pushes the spacing tab 10 formed on the metal plate 100 out of the die hole 24. The metal plate 100 on which the spacing tab 10 is formed can be reliably sent to the next step.

In the manufacturing dies shown in FIGS. 3 to 5, a killer pin 46 and an abutting pin 43 are used as means for projecting one end surface of the level pin 25 from the contact surface of the upper die 20. As shown in FIG.
0 may be provided to move the knockout plate 41 up and down. In the manufacturing mold shown in FIG. 6, the same parts as those in the manufacturing molds shown in FIGS. 1 to 5 are given the same numbers as those in FIGS. 1 to 5, and detailed description is omitted. In the manufacturing die shown in FIG. 6, one end of a rod 52 having a piston (not shown) provided to a cylinder 51 is connected to a knockout plate 41. Therefore, by extending and contracting the rod 52, one end surface of the level pin 25 can be protruded from the contact surface of the upper die 20 or can be drawn into the die hole 24. Therefore, when the upper mold 20 and the lower mold 30 are opened, the rod 52 is extended and the knockout plate 41 is pressed downward, and one end of the level pin 25 is attached to the upper mold 20.
The upper mold 20 and the lower mold 3
When the mold 0 is closed, the rod 52 is shortened, the knockout plate 41 is pulled up, and the level pin 2 is closed.
One end of 5 can be drawn into die hole 24. still,
Although the air cylinder 50 is used in FIG. 6, it goes without saying that a hydraulic cylinder may be used.

[0018]

According to the manufacturing die of the present invention, since a spacing tab having a predetermined height can be formed in one step, the manufacturing die of the heat exchanger fin can be reduced in size, and heat exchange can be achieved. This can contribute to space saving at a manufacturing fin manufacturing plant. In addition, it is possible to efficiently manufacture heat exchanger fins used for a radiator or the like of an automobile in which a spacing tab having a predetermined height is formed.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view showing an example of a manufacturing mold according to the present invention.

FIG. 2 is an explanatory diagram for explaining a step of forming a spacing tab using the manufacturing mold shown in FIG. 1;

FIG. 3 is a partial cross-sectional view showing another example of the manufacturing mold according to the present invention.

FIG. 4 is a partial cross-sectional view for explaining a state when the manufacturing mold shown in FIG. 3 is closed.

FIG. 5 is an explanatory diagram for explaining a step of forming a spacing tab using the manufacturing mold shown in FIG. 3;

FIG. 6 is a partial cross-sectional view showing another example of the manufacturing mold according to the present invention.

FIG. 7 is a perspective view for explaining a conventional heat exchanger fin.

FIG. 8 is a perspective view illustrating an improved heat exchanger fin.

9 is a cross-sectional view illustrating a structure of a spacing tab formed on the heat exchanger fin shown in FIG.

10 is an explanatory diagram illustrating a state in which the heat exchanger fins illustrated in FIG. 8 are stacked.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Spacing tab 12 Heat exchanger fin 20 Upper die 21 Upper die set 22 Die holder 23 Die 24 Die hole 25 Level pin (height adjusting means) 26, 36, 42, 44 Spring (biasing member) 27 Taper jib (Adjusting member) 30 Lower die 32 Punch holder 33 Punch 34 Stripper 35 Hole 37 Stripper guide 40 Gap 41 Knockout plate (Pressing means) 43 Butt pin 46 Killer pin 47 Recess 48 Through hole 49 Screw plug 50 Air cylinder 51 Cylinder 52 Rod

Claims (4)

[Claims] The spacing tab is provided upright so that a plurality of heat exchanger fins each having a through hole through which a heat exchange tube is inserted can be stacked with a spacing tab with a predetermined gap therebetween. In a mold for manufacturing a fin for a heat exchanger that forms a fin for a heat exchanger, a pair of dies, one of which is provided so as to be able to freely move toward and away from the other, constitutes the manufacturing dies. A punch and a die hole are provided, which form a spacing tab by piercing a predetermined portion of the heat exchanger fin or the metal plate for forming the heat exchanger fin, and the pair of molds are closed. When the leading end of the punch is inserted into the die hole to form a spacing tab, height adjusting means for bending the leading end of the formed spacing tab to a predetermined height is provided in the mold. It is noted that Heat exchanger manufacturing mold of fins to. 2. The mold for manufacturing fins for a heat exchanger according to claim 1, wherein an adjusting member for adjusting the position of the contact end of the height adjusting means contacting the tip of the spacing tab is provided in the mold. . 3. The height adjusting means such that when the pair of dies are opened, the contact ends of the height adjusting means project from the contact surfaces of the dies and push the spacing tabs out of the die holes. The pressing means for pressing the means is provided in the mold.
A mold for manufacturing a fin for a heat exchanger according to claim 2. 4. The height adjusting means is a level pin which is bent by abutting one end of the spacing tab on one end of the spacing tab, wherein one end of the level pin is formed by a punch entering a die hole. The level pin according to any one of claims 1 to 3, wherein a level pin is mounted in the mold with one end inserted into the die hole so that the level pin can be brought into contact with the tip of the formed spacing tab. Manufacturing dies for exchanger fins.