JP3789574B2 - Manufacturing mold for heat exchanger fins - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a mold for manufacturing a heat exchanger fin, and more specifically, 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 through a predetermined gap. As described above, the present invention relates to a heat exchanger fin manufacturing mold for forming a heat exchanger fin in which the spacing tab is erected.
[0002]
[Prior art]
2. Description of the Related Art Heat exchanger fins for use in automobile radiators or the like use a heat exchanger fin in which a plurality of through holes with collars shown in FIG. 7 are formed on a strip-shaped metal plate. The collared through-hole is formed by placing two collars 104 and 104 upright along the long axis of the through-hole 102 in an elliptical through-hole 102 through which a heat exchange tube drilled in the metal plate 100 is inserted. Yes. The collars 104 and 104 are for making contact with the side surface of the heat exchange tube having an elliptical cross-sectional shape inserted through the through hole 102 to improve heat exchange efficiency.
Further, pico (spacing tabs) 106 and 106 are erected in the vicinity of the collared through holes. The pico 106 and 106 are for securing 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. is doing.
For this reason, in the heat exchanger fin in which the colored through-hole shown in FIG. 7 is formed, when the gap between the heat exchanger fins is changed, the height of the pico 106, 106 is changed to change the height of the pico 106, 106. It is necessary to change a work tool such as a punch mounted on a manufacturing mold for forming 106.
[0003]
As described above, since it is extremely difficult to change a tool such as a punch mounted on the manufacturing mold, and this is one of the causes of reducing the manufacturing efficiency of the heat exchanger fins, a spacing tab shown in FIG. Heat exchanger fins 10 and 10 are formed in the vicinity of the collared through holes.
The spacing tabs 10 and 10 are formed by piercing a predetermined portion of the metal plate 100 (hereinafter sometimes referred to as lance processing). As shown in FIG. 10, the spacing tabs 10 and 10 are adjusted in height by bending their tips. Therefore, the heat exchanger fins 12, 12,... Formed with the bent bent ends 10, 10,... Are, as shown in FIG. Are stacked at predetermined intervals secured by 10, 10,.
[0004]
[Problems to be solved by the invention]
According to the spacing tab 10 shown in FIG. 9, even if the gap between the heat exchanger fins 12 is changed, the height can be adjusted by adjusting the bending amount of the distal end portion of the spacing tab 10. For this reason, it is not necessary to change machine tools, such as a punch, mounted on a manufacturing die for forming the spacing tab 10.
However, the formation of the spacing tab 10 shown in FIG. 9 is usually performed by bending the spacing tab 10 at the front end after the spacing tab 10 is erected on the metal plate 100 by lance processing. In this way, since the spacing tab 10 is formed in two steps, the heat exchanger fin manufacturing mold is likely to be enlarged.
Accordingly, an object of the present invention is to provide a heat exchanger fin manufacturing mold capable of forming 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 problems, the present inventors use a pair of molds provided with punches and die holes for forming a spacing tab, and a punch is inserted to form the spacing tab. It has been found that if the tip of the formed spacing tab can be bent in the die hole, a spacing tab having a predetermined height can be formed in one step, and the present invention has been achieved.
That is, according to the present invention, the spacing tab is erected so that a plurality of fins for heat exchangers having through holes through which the heat exchange tubes are inserted can be stacked with a spacing tab through a predetermined gap. In a heat exchanger fin manufacturing mold for forming a heat exchanger fin, a pair of molds that constitute the manufacturing mold and that one of the molds is provided so as to be movable toward and away from the other mold Is provided with a punch and a die hole for forming a spacing tab by breaking through a predetermined portion of the heat exchanger fin or the metal strip for forming the heat exchanger fin, and the pair of molds are closed. When the spacing tab is formed by inserting the punch into the die hole, a height adjusting means for bending the leading end portion of the formed spacing tab to a predetermined height is provided with a leading end of the spacing tab. one end Is a level pin that abuts and bends, and one end of the level pin is inserted into the die hole so that one end surface of the level pin can abut the tip of a spacing tab formed by a punch entering the die hole. The heat exchanger fin manufacturing mold is characterized in that the level pin is mounted in the mold in a state of being applied.
[0006]
In the present invention, by providing an adjustment member in the mold for adjusting the position of the abutting end of the height adjusting means that abuts the tip of the spacing tab, the fins for the heat exchanger having different spacing tab heights are provided. It can be formed easily.
Further, when the pair of molds are opened, the pressure adjusting means is pressed so that the contact end of the height adjusting means protrudes from the contact surface of the mold and the spacing tab is pushed out of the die hole. By providing the means in the mold, the heat exchanger fin on which the spacing tab is formed can be easily sent to the next step.
Further, the level pin is formed with a recess into which the tip of the punch is inserted when the pair of molds is closed, and the spacing formed when the tip of the punch is inserted into the recess of the level pin. A spacing tab can be erected on a metal plate by forming an inclined surface in the punch that causes a tab .
[0007]
According to the manufacturing mold of the present invention, when a pair of molds are closed, a spacing tab is formed by piercing a predetermined portion of the heat exchanger fin or the metal strip for forming the heat exchanger fin with a die and a punch. In addition, the tip of the formed spacing tab can be bent by the height adjusting means provided on the mold so that the spacing tab has a predetermined height. For this reason, the front-end | tip part is bent by the metal strip for heat exchanger fins or the fin for heat exchanger formation, and a spacing tab of predetermined height can be formed in one process.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
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 mold 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, and the upper mold 20 is provided so as to be movable toward and away from the lower mold.
In this upper mold 20, a die mold 23 is mounted on a die holder 22 provided in an upper mold set 21. Since the level pin 25 having one end inserted into the die hole 24 formed in the die mold 23 is urged in the direction of the taper jib 27 by a spring 26 as an urging member, the other end surface of the level pin 25 is Abutting the tapered jib 27. The tapered jib 27 is composed of inclined plates 28 and 29 whose inclined surfaces formed in a direction perpendicular to the drawing are in sliding contact with each other, and the flat surface of the inclined plates 28 and 29 is in contact with the other end surface of the upper die set 21 or the level pin 25. Touch.
For this reason, the position in the die hole 24 of the one end surface of the level pin 25 can be changed by moving one of the inclined plates 27 and 28 in the direction perpendicular to the drawing.
[0009]
In the lower mold 30 used as a pair with the upper mold 20, a punch 33 is erected on a punch holder 32 provided on a lower die set 31, and a tip portion thereof is formed on a stripper 34. The hole 35 is entered. 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. 2 (a) and 2 (b), the punch 33 provided in the lower die 30 has a pointed tip and a flat-tipped tip 33a that is narrower than the punch body 33b. The tip portion 33a and the punch body portion 33b are integrally formed via an inclined portion 33c formed with an inclined surface inclined from the rear end portion of the tip portion 33a toward the upper end portion of the punch body portion 33b. Has been.
Further, as shown in FIGS. 2 (a) and 2 (b), the upper die 20 and the level pin 25 inserted into the die hole 24 formed in the die die 23 provided with the upper die 20 are connected to each other. A spacing tab in which a U-shaped recess 25a into which the tip 33a of the punch 33 is inserted when the lower mold 30 is closed is provided, and a peripheral end surface of the recess 25a is formed in the die hole 24. 10 is an abutting surface that abuts against the tip of 10.
[0010]
In FIG. 1, the upper mold 20 and the lower mold 30 constituting a pair of molds are in an open state, and after placing the metal plate 100 on the stripper 34 of the lower mold 30, the upper mold 20 is moved to the lower mold. The spacing tab 10 can be formed on the metal plate 100 by lowering in the direction 30 and closing the mold.
At the time of closing the die, the die die 23 in which the upper die 20 descends and comes into contact with the stripper 34 descends against the urging force of the spring 36 and presses the stripper 34. Therefore, the tip 33a of the punch 33 protrudes from the upper surface of the stripper 34 and is formed in a U-shape formed at one end of the level pin 25 inserted into the die hole 24, as shown in FIG. Is inserted into the recess 25a.
Lance processing is performed on the metal plate 100 placed on the stripper 34 by the tip 33 a of the punch 33, and the spacing tab 10 is formed at a predetermined position of the metal plate 100. At the time of this lance processing, the spacing tab 10 is raised along the inclined surface of the inclined portion 33 c forming the punch 33, 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 portion 33a of the punch 33 is further inserted into the die hole 24, along the inclined surface of the inclined portion 33c of the punch 33. As shown in FIG. 2B, the tip of the raised spacing tab 10 comes into contact with one end surface of the level pin 25.
The upper die 20 in a state where one end surface of the level pin 25 is in contact with the front end of the spacing tab 10 is bottom dead while bending the front end of the spacing tab 10 caused by the punch 33 at one end surface of the level pin 25. Descent to the point position.
[0011]
The upper mold 20 lowered to the position of the bottom dead center is reversed to rise. When the upper die 20 starts to rise, the stripper 34 also rises as the upper die 20 rises, and in the vicinity of the top dead center of the upper die 20, the tip 33a of the punch 33 extracted from the die hole 24 is shown in FIG. As shown in FIG. 1, it is stored in a hole 35 formed in the stripper 34. For this reason, the metal plate 100 placed on the stripper 34 and having the spacing tab 10 formed thereon can move to the next step.
In the manufacturing mold shown in FIGS. 1 to 2, the height of the spacing tab 10 formed on the metal plate 100 is changed by moving one of the inclined plates 28 and 29 constituting the tapered jib 27 in a direction perpendicular to the drawing. This can be easily handled by changing the position of the end face of the level pin 25 in the die hole 24.
[0012]
By the way, in the manufacturing mold shown in FIGS. 1 to 2, since one end surface of the level pin 25 is always located in the die hole 24, the spacing tab 10 formed in the die hole 24 when the mold is opened. Is not pushed out of the die hole 24. Even if such an operation is not performed, the formed spacing tab 10 does not normally adhere to the inner wall surface of the die hole 24. Therefore, when the mold is opened, the spacing tab 10 is outside the die hole 24. You can get out.
However, when there is a possibility that the formed spacing tab 10 may be inserted into the die hole 24 when the mold is opened, it is preferable to use the manufacturing mold shown in FIG.
In addition, about the manufacturing mold shown in FIG. 3, the same part as the manufacturing mold shown in FIGS. 1-2 was provided with the same number as the number of FIGS. 1-2, and detailed description was abbreviate | omitted.
[0013]
In the manufacturing mold of FIG. 3, when the upper mold 20 and the lower mold 30 are opened, one end of the level pin 25 protrudes from the contact surface of the upper mold 20, and the spacing tab 10 is formed outside the die hole 24. It is forcibly pushed out.
In the manufacturing mold shown in FIG. 3, a knockout plate 41 is provided between the taper jib 27 and the die holder 22 via a gap 40. Since this knockout plate 41 is biased in the direction of the die holder 22 by a spring 42 as a biasing member, when the upper mold 20 and the lower mold 30 are opened, one surface of the knockout plate 41 is leveled. One end of the level pin 25 protrudes from the contact surface of the upper mold 20 in contact with the other end surface of the pin 25.
Further, the knockout plate 41 is provided on the die holder 22 and has one end also in contact with the other end surface of the abutting pin 43 protruding from the contact surface of the upper mold 20.
[0014]
On the other hand, the lower die 30 is provided with a spring 44 as a biasing member provided in a recess 47 formed in the lower die set 31 at a position facing the abutment pin 43 of the upper die 20. A killer pin 46 biased in the direction of 20 is provided. One end of the killer pin 46 is located in a through hole 48 that penetrates the stripper 34 when the upper die 20 and the lower die 30 are opened.
Further, the biasing force of the spring 44 that biases the killer pin 46 is greater than the biasing force of the spring 42 that biases the knockout plate 41 downward so that the knockout plate 41 is pushed upward in the direction of the taper jib 2 when the die is opened. Adjust to be larger. Adjustment of the urging force of the spring 44 can be performed by a screw brag 49 screwed into the inlet of the recess 47.
[0015]
When the metal plate 100 is placed on the stripper 34 of the manufacturing mold shown in FIG. 3 and the mold is closed, the upper mold 20 descends in the direction of the lower mold 30 and comes into contact with the die mold 23. 34 is lowered. At this time, as shown in FIG. 4, one end of the abutting pin 43 and one end of the killer pin 46 come into contact with each other, and the knockout plate 41 that comes into contact with the other end of the abutting pin 43 is moved downward. It pushes upward until it abuts against the taper jib 27 against the urging force of the spring 42. Therefore, a gap 40 is formed between the knockout plate 41 and the die holder 22, and one end of the level pin 25 biased by the spring 26 in the direction of the tapered jib 27 is as shown in FIG. , Is drawn into the die hole 24.
[0016]
Thus, when the tip 33a of the punch 33 provided in the lower die 30 is inserted into the die hole 24 into which one end of the level pin 25 is drawn, along the inclined surface of the inclined portion 33c of the punch 33. The leading edge of the spacing tab 10 thus brought 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 surface of the level pin 25 is in contact with the front end of the spacing tab 10 is bottom dead while bending the front end of the spacing tab 10 caused by the punch 33 at one end surface of the level pin 25. Descent to the point position.
Next, the upper die 20 lowered to the position of the bottom dead center is reversed to rise. In the vicinity of the top dead center of the upper die 20 when the upper die 20 is raised, the contact between one end of the abutting pin 43 and one end of the killer pin 46 is released as shown in FIG. The level pin 25 is pressed downward by the urging force. Therefore, as shown in FIG. 5B, one end surface of the level pin 25 protrudes from the contact surface of the upper mold 20, and the spacing tab 10 formed on the metal plate 100 is forcibly pushed 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 process.
[0017]
In the manufacturing mold shown in FIGS. 3 to 5, the killer pin 46 and the abutting pin 43 are used as means for projecting the one end surface of the level pin 25 from the contact surface of the upper mold 20. Similarly, the air cylinder 50 may be provided in the upper mold 20 to cause the knockout plate 41 to move up and down. About the manufacturing mold shown in FIG. 6, the same parts as those in the manufacturing mold shown in FIGS.
In the manufacturing mold of FIG. 6, one end of a rod 52 provided with a piston portion (not shown) on a cylinder 51 is connected to a knockout plate 41. For this reason, 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 mold 20 or pulled 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 so that one end of the level pin 25 protrudes from the contact surface of the upper mold 20. When the upper mold 20 and the lower mold 30 are closed, the rod 52 can be shortened, the knockout plate 41 can be pulled upward, and one end of the level pin 25 can be pulled into the die hole 24.
Although the air cylinder 50 is used in FIG. 6, it goes without saying that a hydraulic cylinder may be used.
[0018]
【The invention's effect】
According to the production mold of the present invention, a spacing tab having a predetermined height can be formed in one step, so that the production mold for the heat exchanger fin can be reduced in size, and the heat exchanger fin production factory It can contribute to space saving. It is also possible to efficiently manufacture heat exchanger fins used in automobile radiators and the like on which spacing tabs of a predetermined height are 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.
4 is a partial cross-sectional view for explaining a state when the manufacturing mold shown in FIG. 3 is closed. FIG.
FIG. 5 is an explanatory diagram for explaining a process 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 for explaining an improved fin for a heat exchanger.
9 is a cross-sectional view illustrating the structure of a spacing tab formed on the heat exchanger fin shown in FIG. 8. FIG.
10 is an explanatory diagram for explaining a state in which the heat exchanger fins shown in FIG. 8 are stacked. FIG.
[Explanation of symbols]
10 Spacing Tab 12 Heat Exchanger Fin 20 Upper Die 21 Upper Die Set 22 Die Holder 23 Die Die 24 Die Hole 25 Level Pin (Height Adjustment Means)
26, 36, 42, 44 Spring (biasing member)
27 Taper jib (adjustment member)
30 Lower mold 32 Punch holder 33 Punch 34 Stripper 35 Hole 37 Stripper guide 40 Gap 41 Knockout plate (pressing means)
43 Butting pin 46 Killer pin 47 Recessed portion 48 Through hole 49 Screw plug 50 Air cylinder 51 Cylinder 52 Rod

Claims (4)

The heat exchanger fins on which the spacing tabs are erected are arranged so that a plurality of the heat exchanger fins having through holes through which the heat exchange tubes are inserted can be stacked with a spacing tab through a predetermined gap. In the heat exchanger fin manufacturing mold to be formed,
A metal plate for forming the heat exchanger fins or the heat exchanger fins is provided on a pair of molds that constitute the manufacturing mold and one of the molds is provided so as to be movable toward and away from the other mold. Punches and die holes are provided to form spacing tabs that break through predetermined locations of
Further, when the pair of molds are closed and the leading end of the punch is inserted into the die hole to form the spacing tab, the leading end of the formed spacing tab is bent to a predetermined height. The height adjusting means is a level pin that bends with the tip of the spacing tab being in contact with one end surface, and the tip of the spacing tab is formed by punching one end surface of the level pin into the die hole. A mold for manufacturing heat exchanger fins , wherein a level pin is mounted in a mold in a state where one end portion is inserted into the die hole .   The mold for manufacturing a fin for a heat exchanger according to claim 1, wherein an adjustment member for adjusting the position of the abutting end of the height adjusting means that abuts the tip of the spacing tab is provided in the mold.   When the pair of molds are opened, the pressing of pressing the height adjusting means so that the contact end of the height adjusting means protrudes from the contact surface of the mold and pushes the spacing tab out of the die hole. The mold for producing a fin for a heat exchanger according to claim 1 or 2, wherein the means is provided in the mold. The level pin is formed with a recess into which the tip of the punch is inserted when the pair of molds are closed.
The heat exchanger fin according to any one of claims 1 to 3, wherein an inclined surface that causes a formed spacing tab is formed on the punch when a leading end of the punch is inserted into the recess of the level pin. Manufacturing mold.

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