JP3811542B2 - Mold apparatus and fin manufacturing method for heat exchanger - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a mold apparatus for forming a collared through hole in which a peripheral edge of a drilled through hole is surrounded by a collar having a predetermined height on a metal thin plate, and a heat exchanger using the mold apparatus The present invention relates to a fin manufacturing method.
[0002]
[Prior art]
As shown in FIG. 7, the heat exchanger fin used in the heat exchanger such as a cooler has the collar 14 of the plate-like body 11 so as to surround the periphery of the through hole 12 formed in the belt-like plate-like body 11. A plurality of through-holes with collars 15 formed so as to protrude on one side are formed along the longitudinal direction of the plate-like body 11. A flange 17 is formed at the tip of the collar 14.
Such heat exchanger fins 10 are usually manufactured by a draw method or a drawless method, and are manufactured by a heat exchanger fin manufacturing apparatus shown in FIG.
A thin metal plate 20 made of a metal such as aluminum, which is a workpiece of the heat exchanger fin 10, is wound in a coil shape and installed on an uncoiler 22.
The thin plate 20 drawn from the uncoiler 22 through the pinch roll 24 is inserted into the oil applying device 26, and the processing oil is adhered to the surface thereof.
The thin plate 20 provided with oil on its surface is supplied to a mold device 30 provided in the press device 28.
[0003]
The mold apparatus 30 includes an upper die set 27 that can move up and down and a lower die set 29 that is stationary.
Usually, in the draw method, a drawing process for forming a container portion having a bottom diameter larger than the opening diameter of the collared through-hole 15 to be formed on the metal thin plate 20 and a predetermined height by the drawing process. A piercing burring process in which a through-hole is formed in the container portion and the edge of the through-hole is formed on the collar 14 and a flange 17 is formed on the tip of the collar 14 formed by the piercing burring process. Colored through holes 15 are formed by the process. The drawing process is also divided into a plurality of processes, and several squeezing processes are performed so as to gradually squeeze the bottom surface diameter of the formed container portion.
In the mold apparatus 30, each of these processes is sequentially provided between the upper die set 27 and the lower die set 29, and the thin plate 20 is attached to the upper die set 27, the lower die set 29, and the like. When the upper die set 27 and the lower die set 29 are closed and the thin plate 20 is pressed, and the upper die set 27 and the lower die set 29 are opened. The operation of transferring the thin plate 20 by a predetermined interval by a transfer device to be described later is repeated, and the collared through hole 15 is formed on the thin plate 20.
The thin plate 20 in which the collared through holes 15 are formed is cut to a predetermined length so as to be a strip-like plate-like body 11 including a predetermined number of collared through holes 15, and is used as the heat exchanger fins 10 from the outlet 31. Discharged. The heat exchanger fins 10 discharged from the outlet 31 are loaded on the stacker 34.
Further, a feeder device 32 is provided in the press device 28 at a supply port for supplying the thin plate 20 to the mold device 30. The feeder device 32 is used only for preparation for forming the collared through hole 15, and the end portion of the thin plate 20 is placed between the upper die set 27 and the lower die set 29 of the die device 30. A feeding device that feeds into the mold device 30 and is used until the thin plate 20 is pulled and transported by a transport device provided on the other end side of the mold device 30.
[0004]
FIG. 9 shows a conventional mold apparatus used in the heat exchanger fin manufacturing apparatus shown in FIG. FIG. 9A is a schematic view of a conventional mold apparatus, in which a through-hole 15 with a collar is formed in a thin metal plate 20 by a draw method.
In the mold apparatus shown in FIG. 9A, the draw process is performed over four steps. Such a drawing process is performed in the order of the processes A to D shown in FIG. 9 and includes a draw punch and a die.
First, in the first draw step A, a container portion 16a having a bottom diameter larger than the opening diameter of the collared through hole 15 is formed on the thin plate 20 by the first draw punch 36 provided in the lower die set 29. Form.
The thin plate 20 on which the container portion 16a is formed in the first draw process A is then transferred to the second draw process B. In the second draw process B, the container part 16b is formed by increasing the height while reducing the diameter of the container part 16a by the second draw punch 42 provided in the lower die set 29.
The thin plate 20 on which the container portion 16b is formed in the second draw process B is then transferred to the third draw process C. In the third draw step C, the container portion 16c is formed by increasing the height while reducing the diameter of the container portion 16b by the third draw punch 44 provided in the lower die set 29.
The thin plate 20 on which the container portion 16c is formed in the third draw process C is then transferred to the fourth draw process D. In the fourth draw step D, the container portion having a predetermined diameter and height is increased by increasing the height while reducing the diameter of the container portion 16c by the fourth draw punch 45 provided in the lower die set 29. 16d is formed.
[0005]
The thin plate 20 on which the container portion 16d is formed in the fourth draw process D is divided into a piercing burring process E, a positioning process F, a flaring process G, a cut and raised slit process H, a side trim process I, and a positioning process shown in FIG. It is transferred in the order of J, thin plate cutting step K, and transfer step L.
Among these steps, in the piercing burring step E, a through hole is formed in the bottom surface of the container portion 16d by the piercing punch 48 provided in the upper die set 27 and the burring punch 46 provided in the lower die set 29. The piercing process and the burring process for raising the periphery of the through hole are performed almost simultaneously. Through the piercing burring step E, a collared through hole 15 is formed in which a collar 14 having a predetermined height is erected on the periphery.
The thin plate 20 in which the collared through holes 15 are formed in the piercing burring process E is transferred to the positioning process F. In the positioning step F, the pilot pins 49 provided on the lower die set 29 are inserted into the collared through holes 15 to position the thin plate 20. The pilot pin 49 has a rounded tip and is formed to have a slightly smaller diameter than the inner diameter of the through hole. For this reason, only the positioning of the thin plate 20 can be performed without performing any processing on the through-hole 15 with the collar formed in the piercing burring step E. This is to improve the processing accuracy in the preceding and following processes.
In the positioning process F, the thin plate 20 positioned by inserting the pilot pins 49 into the collared through-holes 15 is transferred to the reflaring process G. In the reflare process G, the front end portion of the collar 14 is bent by the reflare punch 52 provided in the upper die set 27 to form the flange 17.
[0006]
In the reflare process G, the thin plate 20 having the flange 17 formed at the tip end portion of the collar 14 is cut and raised and transferred to the slit process H. In the cut and raised slit process H, a cut and raised slit 59 (FIG. 9B) is formed in the thin plate 20 around the through hole 15 with the collar by a cut and raised slit punch (not shown). The cut-and-raised slit 59 is provided to improve the thermal efficiency of the heat exchanger fins. In addition, in order to improve the thermal efficiency of the heat exchanger fins, a simple slit or louver may be formed on the thin plate in addition to the cut and raised slit.
The thin plate 20 on which the cut and raised slit 59 is formed around the through-hole 15 with the collar in the cut and raised slit process H is then transferred to the side trim process I. In the side trim process I, both sides of the thin plate 20 are cut in the longitudinal direction so as to have a predetermined width by a side cutter (not shown).
The thin plate 20 having a predetermined width obtained by cutting both sides in the side trim process I is transferred to the positioning process J. In the positioning step J, the pilot pin 54 provided on the lower die set 29 is inserted into the collared through hole 15 to position the thin plate 20. Like the pilot pin 49 described above, the pilot pin 54 has a rounded tip and is formed to have a slightly smaller diameter than the inner diameter of the through hole. For this reason, in the positioning step J, only the positioning of the thin plate 20 can be performed without performing any processing on the collared through holes 15. This is for improving the cutting accuracy in the next thin plate cutting step K.
In the positioning step F, the thin plate 20 positioned by inserting the pilot pin 54 is transferred to the thin plate cutting step K. In the thin plate cutting step K, a cutter (not shown) that continuously cuts between the colored through hole rows in the longitudinal direction of the thin plate 20 is provided, and the thin plate 20 is cut into a plate-like body 11 having a predetermined width. .
[0007]
The thin plate 20 cut in the thin plate cutting step K and formed with the plate-like body 11 having a predetermined width is transferred to the transfer step L. In the transfer process L, a hitch feeder 100 which is a transfer device for the thin plate 20 shown in FIG. 10 is provided, and the thin plate 20 is intermittently transferred by the hitch feeder 100 in the direction of arrow a in FIG. The hitch feeder 100 is configured such that a feed pin 56 urged upward by a spring 102 and having a part of a tip end surface formed on an inclined surface is erected on a movable plate 104 that can reciprocate in the direction of arrow b. Is done. In the hitch feeder 100, the feed pin 56 is inserted into the collared through hole 15, and the moving plate 104 moves in the direction of arrow a by a predetermined interval so that the thin plate 20 can be processed in the next process. By doing so, the thin plate 20 can be intermittently transferred. While the moving plate 104 moved in the direction of the arrow a returns to the initial position, the inclined surface of the front end surface of the feed pin 56 contacts the lower end of the collar 14 as shown by the dotted line in FIG. It is pushed in. During this time, only the hitch feeder 100 can return to the initial position while the thin plate 20 remains stationary.
The thin plate 20 having the feed pin 56 inserted and transferred in the transfer process L is then transferred to the end cut process M. In the end cut process M, a cutter (not shown) for cutting each of the plate-like bodies 11 formed with the collared through-hole rows to a predetermined length is provided, and the heat exchanger fin 10 cut to a predetermined length. Is manufactured.
[0008]
By the way, in the preparatory stage before the formation of the through-hole 15 with the collar is started, it is necessary to supply the end of the unprocessed thin plate 20 into the mold apparatus 30 so that the hitch feeder 100 can transfer it. It is.
However, the unprocessed thin plate 20 before the formation of the collared through hole 15 is not formed with the collared through hole 15 into which the feed pin 56 of the hitch feeder 100 is inserted. It cannot be transferred.
For this reason, the end of the unprocessed thin plate 20 is fed step by step from the first draw step A to the thin plate cutting step K, and the collared through-hole 15 first formed in the unprocessed thin plate 20 reaches the transfer step L. Until then, a method of intermittently feeding the thin plate 20 into the mold apparatus 30 by the feeder apparatus 32 provided in the press apparatus 28 has been adopted.
[0009]
[Problems to be solved by the invention]
In this way, by using the feeder device 32 provided in the press device 28, the thin plate 20 is fed into the mold device 30, and after the collared through hole 15 is inserted into the feed pin 56 of the hitch feeder 100, The thin plate 20 can be pulled and transferred from one end side of the mold apparatus 30 to the other end side by the hitch feeder 100 without using the feeder apparatus 32.
However, until the feed pin 56 of the hitch feeder 100 is inserted into the through-hole 15 with the collar formed in the thin plate 20 supplied from one end side of the mold apparatus 30, the thin plate 20 performs a plurality of steps. Passing the thin plate 20 through the feeder device 32 in order through the feeder device 32 is a time-consuming operation.
Further, the collared through hole 15 formed until the thin plate 20 is transferred by the feed pin 56 of the hitch feeder 100 is formed without the thin plate 20 being sufficiently positioned by the two positioning steps F and J. Is. For this reason, the position accuracy of the formed through-hole 15 with the collar is insufficient, and the thin plate 20 with the through-hole 15 with the collar formed before the thin plate 20 is transferred by the feed pin 56 of the hitch feeder 100. Will be disposed of.
In addition, in the operation of feeding the thin plate 20 into the mold apparatus 30 by the feeder device 32, there is a possibility that the thin plate is slackened or bent in the mold apparatus 30. In particular, as the thickness of the thin plate 20 progresses to reduce the weight of the heat exchanger fins as recently, there is a high possibility that the thin plate will be slack or bent.
For this reason, it is desired that the thin plate 20 can be transferred by the feed pin 56 of the hitch feeder 100 in as short a time as possible.
[0010]
Therefore, the object of the present invention is to enable the transfer device provided on the end side in the thin plate transfer direction from one end side in as short a time as possible before starting the formation of the collared through hole in the metal thin plate. An object of the present invention is to provide a mold apparatus and a heat exchanger fin manufacturing method capable of transferring a thin plate in the direction of the other end.
[0011]
[Means for Solving the Problems]
  The inventors of the present invention have studied to solve the above-mentioned problem. If the feed pin 56 of the hitch feeder 100 is inserted into the feed pin 56 even if it is not the collared through-hole 15 but a simple through-hole, the thin plate 20 is removed. The upper die set 27 and the lower die set are placed on an unprocessed thin plate 20 inserted in advance between the upper die set 27 and the lower die set 29 up to the vicinity of the hitch feeder 100. It was found that if the through-hole could be drilled by closing the mold with 29, the feed pin 56 of the hitch feeder 100 could be easily inserted into the through-hole, and the thin plate 20 could be transferred by the hitch feeder 100, thus reaching the present invention.
  That is, the present invention is a metal thin plate that is intermittently transferred from one end side to the other end side between an upper die set and a lower die set, at least one of which is provided in the press device so as to be movable up and down. In addition, in the mold apparatus in which each of the steps for forming the collared through holes is sequentially provided in the transfer direction of the metal thin plate, before the formation of the colored through holes, the upper die set and the lower die set in advance are formed. Drilling means for drilling a feed hole by closing the upper die set and the lower die set in a raw metal thin plate fed to a predetermined position between the die set and the die A feed pin is inserted into the feed hole formed in the metal thin plate which is provided on the other end side of the apparatus and is fed in the direction of the other end side of the mold apparatus using a feed apparatus installed on the press apparatus side. Use the feeding device when Intermittently and a transfer device that enables the transfer to the other side direction from one end of the mold apparatus a metal sheet withoutThe punching means is disposed between one end side of the mold apparatus and the transfer device so as to be inserted into a through hole drilled in the metal thin plate to position the metal thin plate. And a pilot pin having a tip formed at a sharp tip so as to pierce the feed hole when an unprocessed metal thin plate is fed and the upper die set and the lower die set are closed It is characterized byIt is said.
  According to the present invention, the feed hole into which the feed pin of the transfer device can be inserted is formed in the unprocessed metal thin plate before the through-hole with the collar is formed. For this reason, it is possible to transfer the thin plate by a transfer device provided in the mold device in the direction from the one end side to the other end side in as short a time as possible.Moreover, the feed hole into which the feed pin of the transfer device is inserted can be easily formed in the unprocessed thin plate.
[0012]
  TheFurthermore, a piercing process of drilling a small hole in a metal thin plate and a burring process of burring the small hole with a burring punch are separate processes, and the tip of the burring punch is When the upper die set and the lower die set are closed in the raw metal sheet fed between the upper die set and the lower die set by the feeding device, a hole is formed. As a result, by forming a sharp tip, a thin burring punch is formed when a burring punch with a non-sharp tip is placed on an unprocessed thin plate without a small hole. Cracks and distortions can be prevented.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Preferred embodiments of a mold apparatus and a heat exchanger fin manufacturing method according to the present invention will be described below in detail with reference to the accompanying drawings. In addition, the same code | symbol is attached | subjected about the part same as the part demonstrated in FIGS. 6-10, and detailed description is abbreviate | omitted.
[0014]
First, FIG. 1 shows an outline of a draw type mold apparatus according to the present invention.
In the mold apparatus shown in FIG. 1, the tip portions of the pilot pins 50 and 55 in the positioning steps F and J are formed at a sharp tip portion so that a feed hole can be formed in the unprocessed thin plate 20. Therefore, a feed hole into which the feed pin 56 of the hitch feeder 100 can be inserted by closing the upper die set 27 and the lower die set 29 on the unprocessed thin plate 20 inserted up to the positioning step J Can be drilled with pins 50 and 55.
Since the diameter of the pilot pins 50 and 55 is slightly smaller than the inner diameter of the collared through hole 15, the pilot pins 50 and 55 are provided with a collar when inserted into the collared through hole 15. The through hole 15 is not subjected to any processing by the pilot pins 50 and 55 and only positions the thin plate 20.
[0015]
Next, based on FIG. 2, the end of the unprocessed thin plate 20 before the formation of the collared through-hole 15 is started is supplied into the mold apparatus 30 and the manufacture of the heat exchanger fins is started. The preparation process will be described.
First, the end of the thin plate 20 is inserted up to the positioning step J by the feeder device 32 (FIG. 8) or manually.
Next, the feed hole 60 is formed in the thin plate 20 by the pilot pins 50 and 55 by the first mold closing operation of the upper die set 27 and the lower die set 29 of the mold apparatus 30.
Thereafter, the feeder device 32 moves the thin plate 20 by a predetermined distance when the upper die set 27 and the lower die set 29 are opened. For this reason, after the feed hole 60 drilled by the pilot pin 54 is inserted into the mold apparatus 30, the transfer process L is reached after several mold closing operations in FIG. At that time, the feed pin 56 of the hitch feeder 100 is inserted into the feed hole 60, and the thin plate 20 can be transferred by the hitch feeder 100.
As described above, when the thin plate 20 can be transferred by the hitch feeder 100, it is not necessary to feed the thin plate 20 into the mold device 30 by the feeder device 32, so that the operation of the feeder device 32 is stopped.
[0016]
According to the mold apparatus shown in FIGS. 1 and 2, since the tip portions of the pilot pins 50 and 55 are sharp tip portions, the feed hole 60 into which the feed pin 56 of the hitch feeder 100 can be inserted is formed in the through-hole 15 with collar. Can be drilled before forming.
That is, when inserting the end of the unprocessed thin plate 20 into the mold apparatus 30, the end of the thin plate 20 is inserted at a time until the positioning step J, and the upper die set 27 and the lower die set 29 are inserted. The feed pin 56 of the hitch feeder 100 can be inserted into the feed hole 60 formed by closing the mold, and the thin plate 20 can be transferred by the feed pin 56 of the hitch feeder 100 in as short a time as possible. At this time, in the positioning step F, the feed hole can be smoothly drilled in the unprocessed thin plate 20 by the pilot pin 50. For this reason, the crack and distortion of the thin plate 20 which generate | occur | produces by driving the thin plate 20 with a non-sharp pilot pin in the raw material can be prevented.
Furthermore, the time for using the feeder device 32 can be shortened, and the risk of loosening or bending of the thin plate 20 in the mold device 30 can be eliminated.
[0017]
Here, in the first mold closing operation when the end portion of the unprocessed thin plate 20 is inserted into the mold apparatus 30, the third draw process C and the fourth draw process for forming the container part of a predetermined height. The height of the draw punches 44 and 45 provided in D is higher than the height of the draw punches 36 and 42 provided in the first draw process A and the second draw process B. If the thin plate 20 that has not been formed is directly subjected to the squeezing process, there is a tendency that problems such as cracking and distortion of the thin plate are likely to occur.
Therefore, as shown in FIG. 2, when the first mold closing is performed on the end of the unprocessed thin plate 20, the lower die set 29 from the first draw process A to the fourth draw process D is provided. The height of the draw punch may be adjusted so that the container portion is not formed. If it does in this way, since it does not directly squeeze the unprocessed thin plate 20, the crack and distortion of the thin plate 20 can be prevented.
The height-adjusted draw punch is returned to a height at which the container portion can be formed when the thin plate 20 can be transferred by the hitch feeder 100.
[0018]
The mold apparatus according to the present invention can also be applied to a mold apparatus that employs a so-called drawless system that has already been proposed in Japanese Patent Publication No. 3-58817.
This drawless system is a piercing process that drills a small hole in a thin plate, a burring process that raises the peripheral edge of the small hole, and a squeezing that forms a collared through hole by spreading the raised protruding piece while squeezing This method consists of a process.
FIG. 3 shows a schematic diagram of a die-less mold apparatus. In the mold apparatus shown in FIG. 3, forming steps e and f for forming a cylindrical container portion having a thin plate thickness near the center of the upper surface on a thin plate, and a through hole is formed near the center of the upper surface of the formed container portion. A collared through hole is formed by the piercing and ironing step g in which the side surface of the container portion is raised and the raised protruding piece is squeezed and spread.
[0019]
In the mold apparatus shown in FIG. 3, the forming process is performed twice. First, a conical part is formed, and this conical part is formed in a cylindrical container part.
First, in the first forming step e, the thin plate 20 is formed with a conical portion 116 whose plate thickness near the apex is thinner than other portions of the thin plate 20 by the forming punch 114 provided in the lower die set 29.
In the first forming step e, the thin plate 20 on which the conical portion 116 is formed is transferred to the second forming step f. In the second forming step f, the vicinity of the apex of the conical portion 116 is mainly extended by the forming punch 115 to form a cylindrical container portion 117 whose plate thickness near the center of the upper surface is thinner than the others.
In the second forming step f, the thin plate 20 on which the container portion 117 is formed is transferred to the piercing ironing step g. In the piercing ironing step g, a piercing process in which a small hole is formed in the upper surface of the container portion 117 by the piercing punch 118 provided in the upper die set 27, and the ironing punch 120 provided in the lower die set 29 is performed. Burring process in which the tip part raises the side surface of the container part 17 to form a protruding piece, and the protruding piece is ironed by the outer peripheral surface of the ironing punch 120 and the inner wall surface of the ironing bush 121 provided in the upper die set 27. The ironing process is performed almost simultaneously. Through the piercing ironing process g, the collared through holes 15 are formed in the thin plate 20.
[0020]
In the piercing ironing process g, the thin plate 20 on which the collared through holes 15 are formed is transferred to the positioning process h. In the positioning step h, the pilot pin 122 provided in the lower die set 29 is inserted into the through hole 15 with the collar to position the thin plate 20.
In the positioning step h, the thin plate 20 in which the collared through-holes 15 are formed is transferred in the order of the flaring step, the cut and raise slit step, and the side trim step. These processes are the same as those of the mold apparatus using the draw method in FIGS. 1 and 2, and detailed description thereof is omitted.
[0021]
Following the side trim step, the thin plate 20 is transferred to the positioning step i. In the positioning step i, the pilot pins 124 provided on the lower die set 29 are inserted into the through holes 15 with the collar to position the thin plate 20.
In the positioning step i, the thin plate 20 positioned by inserting the pilot pin 124 is transferred to the thin plate cutting step. This thin plate cutting step is the same as that of the draw type mold apparatus in FIGS. 1 and 2, and detailed description thereof is omitted.
[0022]
Following the thin plate cutting step, the thin plate 20 is transferred to the transfer step j. In the transfer step j, a hitch feeder 100 which is a transfer device is provided in the same manner as the draw type mold device in FIGS. 1 and 2, and the feed pin 56 of the hitch feeder 100 is placed in the through-hole 110 with a collar. The thin plate 20 is intermittently transferred in the direction of the outlet 31 (FIG. 8) by being inserted.
The collared through hole 110 into which the feed pin 56 is inserted in the transfer step j is then transferred to the end cut step. This end cutting process is also the same as that of the mold apparatus by the draw method in FIGS.
[0023]
In such a positioning step h, i of the mold apparatus shown in FIG. 3, the tip portions of the pilot pins 122, 124 are formed at the sharp tip portions, and the feed pin 56 is formed on the unprocessed thin plate 20. A sharp tip is formed so that the feed hole that can be inserted can be drilled, and the drilled hole can be drilled in the unprocessed thin plate 20. Since the diameters of the pilot pins 122 and 124 are formed to be slightly smaller than the inner diameter of the collared through hole 15, when the pilot pin 122 is inserted into the collared through hole 15, the collared through hole is inserted. Only the positioning of the thin plate 20 can be performed without performing any processing on the plate 15.
[0024]
Next, in the mold apparatus shown in FIG. 3, the end of the unprocessed thin plate 20 before the formation of the collared through holes 15 is started is supplied into the mold apparatus, and manufacture of the fins for the heat exchanger is started. In the preparation process up to this, first, the end of the thin plate 20 is inserted until the positioning process i by the feeder device 32 (FIG. 8) or by hand.
Then, by the first mold closing operation of the upper die set 27 and the lower die set 29 of the mold apparatus, the pilot pin 122 and the pilot pin 124 make a feed hole in which the feed pin 56 can be inserted into the thin plate 20. Set up.
Thereafter, the feeder device 32 moves the thin plate 20 by a predetermined amount when the upper die set 27 and the lower die set 29 are opened so that the thin plate 20 passes through the entire manufacturing process. For this reason, after the feed hole drilled by the pilot pin 84 is inserted into the mold apparatus, the transfer process i is reached after several mold closing operations in FIG. At that time, the feed pin 56 of the hitch feeder 100 is inserted into the feed hole, and the thin plate 20 can be transferred by the hitch feeder 100.
As described above, when the thin plate 20 is transferred by the hitch feeder 100, it is not necessary to feed the thin plate 20 into the mold device by the feeder device 32, so that the operation of the feeder device 32 is stopped.
[0025]
According to the mold apparatus shown in FIG. 3, since the tip portions of the pilot pins 122 and 124 are pointed tip portions, the feed hole into which the feed pin 56 of the hitch feeder 100 can be inserted is formed before the through-hole 15 with the collar is formed. Can be drilled.
That is, when inserting the end of the unprocessed thin plate 20 into the mold apparatus, the end of the thin plate 20 is inserted at a time until the positioning step i, and the upper die set 27 and the lower die set 29 are inserted. The feed pin 56 of the hitch feeder 100 can be inserted into the feed hole formed by closing the mold, and the thin plate 20 can be transferred by the feed pin 56 of the hitch feeder 100 in as short a time as possible. At this time, in the positioning step h, the feed hole can be smoothly drilled in the unprocessed thin plate 20 by the pilot pin 122. For this reason, the crack and distortion of the thin plate 20 which generate | occur | produces by driving the thin plate 20 with a non-sharp pilot pin in the raw material can be prevented.
Furthermore, the time for using the feeder device 32 can be shortened, and the risk of loosening or bending of the thin plate 20 in the mold device can be eliminated.
[0026]
Next, FIG. 4 shows another example of a mold apparatus using a drawless method. The mold apparatus shown in FIG. 4 includes a piercing burring process T in which a small hole 70 is first formed in the thin plate 20 and a peripheral edge of the small hole 70 is raised to form a protruding piece, and a protrusion formed in the piercing burring process T. A step of forming a through-hole 15 with a collar by an ironing step V that spreads while squeezing a piece is provided.
In the mold apparatus shown in FIG. 4, the tip portions of pilot pins 74 and 76 provided in the lower die set 29 in the positioning steps U and W are formed as sharp tip portions, and further in the ironing step V, the lower die The tip of the ironing punch 78 provided in the set 29 is also formed at a sharp tip.
Thus, it is also suitable to apply the present invention to the mold apparatus shown in FIG.
[0027]
Next, a description will be given of a mold apparatus in which a piercing process for drilling a small hole in a thin plate and a burring process for raising a peripheral edge of the small hole drilled by the piercing process are separate processes.
FIG. 5 shows an outline of a mold apparatus in which the piercing process and the burring process are separate processes. Further, as shown in FIG. 6, the heat exchanger fin formed by the mold apparatus shown in FIG. 5 has a long through hole and no flange is formed at the tip of the collar.
Such a mold apparatus includes a piercing process for drilling a small hole in a thin plate, a burring process for raising a peripheral part of the small hole to form a through hole with a collar, a positioning process, and a spacing tab processing process thereafter. It is arranged.
[0028]
First, in the piercing step N, a small hole 91 is formed in the thin plate 20 by a piercing punch 90 provided in the upper die set 27. The thin plate 20 in which the small holes 91 are formed is transferred to the next burring step O. In the burring step O, the burring punch 92 provided in the lower die set 29 is inserted into the small hole 91 formed in the piercing step N, and the peripheral portion of the small hole 91 is raised to form a collar.
[0029]
In the burring step O, the thin plate 20 in which the collared through holes 110 are formed is transferred to the positioning step P. In the positioning process P, the thin plate 20 is positioned by inserting pilot pins 111 provided on the lower die set 29 into the through holes 110 with a collar.
In the positioning step P, the thin plate 20 that has been positioned by inserting the pilot pins 111 is transferred to the spacing tab processing step Q. In the spacing tab processing step Q, a tab processing pin 96 provided on the lower die set 29 punches a spacing tab 97 around the collared through hole 110.
In the spacing tab processing step Q, the thin plate 20 on which the spacing tab 97 is formed is transferred to the side trim step. This side trim process is the same as that of the mold apparatus by the draw method in FIGS. 1 and 2, and detailed description thereof is omitted.
[0030]
Following the side trim step, the thin plate 20 is transferred to the positioning step R. In the positioning step R, the thin plate 20 is positioned by inserting the pilot pins 112 provided in the lower die set 19 into the through holes 110 with a collar.
In the positioning step R, the thin plate 20 that is positioned by inserting the pilot pin 112 is then transferred to the thin plate cutting step. This thin plate cutting step is the same as that of the mold apparatus by the draw method in FIGS. 1 and 2, and detailed description thereof is omitted.
Following the thin plate cutting step, the thin plate 20 is transferred to the transfer step S. In the transfer step S, a hitch feeder 100 is provided as in the draw method in FIGS. 1 and 2, and the thin plate 20 is removed by inserting the feed pin 56 of the hitch feeder 100 into the through hole 110 with a collar. It can be intermittently transferred in the direction of the outlet 31 (FIG. 8).
The collared through hole 110 into which the feed pin 56 has been inserted in the transfer step S is then transferred to the end cut step. This end cutting process is also the same as that of the mold apparatus by the draw method in FIGS. 1 and 2, and detailed description thereof is omitted.
[0031]
In such a burring step O of the mold apparatus shown in FIG. 5, the tip of the burring punch 92 is unprocessed thin plate 20 when the upper die set 27 and the lower die set 29 are closed. In addition, a sharp tip is formed so that a feed hole into which the feed pin 56 can be inserted is formed. The sharp tip of the burring punch 92 includes a non-processed portion 92a formed to have a width and length slightly smaller than the width and length of the small hole 91, and a processed portion 92b that raises the periphery of the small hole 91. It is formed in two stages. When the burring punch 92 is inserted into the small hole 91, the non-processed portion 92a is first inserted into the small hole 91, so that no processing is performed on the inner wall of the small hole 91, and then the processed portion 92b is small. Since it inserts in the hole 91, the peripheral part of the small hole 91 can be stood | started up favorably.
In the positioning steps P and R, the tip portions of the pilot pins 111 and 112 are sharp tip portions so that a feed hole into which the feed pin 56 can be inserted can be formed in the unprocessed thin plate 20. . The width and length of the pilot pins 111 and 112 are slightly smaller than the width and length of the collared through hole 15, so that when the pilot pin 111 is inserted into the collared through hole 110, the collar Only the positioning of the thin plate 20 can be performed without performing any processing on the attached through hole 110.
[0032]
Next, the end of the unprocessed thin plate 20 before the formation of the collared through hole 110 is supplied to the mold apparatus shown in FIG. 5, and the manufacture of the heat exchanger fins is started. In the preparation process up to, first, the end of the thin plate 20 is inserted up to the positioning process R by the feeder device 32 (FIG. 8) or manually.
Next, a feed hole into which the feed pin 56 can be inserted is formed in the thin plate 20 by the pilot pins 111 and 112 by the first mold closing operation of the upper die set 27 and the lower die set 29 of the mold apparatus. At the same time, the burring punch 92 also forms a hole for inserting the feed pin 56 into the thin plate 20.
Thereafter, the feeder device 32 moves the thin plate 20 by a predetermined interval when the upper die set 27 and the lower die set 29 are opened so that the thin plate 20 passes through the entire manufacturing process. For this reason, in FIG. 5, at least the feed hole drilled by the pilot pin 112 is the transfer step S after the mold closing operation several times after the unprocessed thin plate 20 is inserted into the mold apparatus. To reach. At that time, the feed pin 56 of the hitch feeder 100 is inserted into the feed hole, and the thin plate 20 can be transferred by the hitch feeder 100.
When the thin plate 20 can be transferred by the hitch feeder 100, it is not necessary to feed the thin plate 20 into the mold device by the feeder device 32, so that the operation of the feeder device 32 is stopped.
[0033]
According to the mold apparatus in which the piercing process N and the burring process O shown in FIG. 5 are separate processes, since the tip portions of the pilot pins 111 and 112 are sharp tip portions, the feed pin 56 of the hitch feeder 100 is inserted. Possible feed holes can be drilled before the collared through-hole 110 is formed.
That is, when inserting the end portion of the unprocessed thin plate 20 into the mold apparatus, the end portion of the thin plate 20 is inserted at a time until the positioning step R, and the upper die set 27 and the lower die set 29 are inserted. The feed pin 56 of the hitch feeder 100 can be inserted into the feed hole formed by closing the mold, and the thin plate 20 can be transferred by the feed pin 56 of the hitch feeder 100 in as short a time as possible. At this time, in the positioning step P, the feed hole can be smoothly drilled in the unprocessed thin plate 20 by the pilot pin 111. For this reason, the crack and distortion of the thin plate 20 which generate | occur | produces by driving the thin plate 20 with a non-sharp pilot pin in the raw material can be prevented.
Furthermore, the time for using the feeder device 32 can be shortened, and the risk of loosening or bending of the thin plate 20 in the mold device can be eliminated.
Further, since the tip of the burring punch is a sharp tip, the end of the unprocessed thin plate 20 is inserted up to the positioning step R, and the first die closing is performed directly on the unprocessed thin plate 20. As in the case of performing burring, problems such as cracking and distortion of the thin plate caused by applying an excessive pressure to the thin plate 20 can be prevented.
[0034]
【The invention's effect】
According to the mold apparatus and the heat exchanger fin manufacturing method using the mold apparatus according to the present invention, the feed hole into which the feed pin of the hitch feeder can be inserted is drilled before the through-hole with the collar is formed. be able to. In other words, when inserting the end of the unprocessed thin plate into the mold apparatus, the end of the thin plate is inserted at a time until the positioning process, and the upper die set and the lower die set are closed. The feed pin of the transfer device can be inserted into the formed feed hole and can be transferred by the transfer device in as short a time as possible.
[Brief description of the drawings]
FIG. 1 is a schematic view of a mold apparatus using a draw method according to the present invention.
FIG. 2 is an explanatory view when an unprocessed metal thin plate is inserted into the mold apparatus shown in FIG. 1 and the initial mold closing is performed.
FIG. 3 is a schematic view of a mold apparatus using a drawless method according to the present invention.
FIG. 4 is a schematic view of a mold apparatus according to another embodiment of the drawless system.
FIG. 5 is a schematic view of a mold apparatus in which a piercing process and a burring process according to the present invention are separate processes.
6 is an explanatory view for explaining a heat exchanger fin manufactured by the mold apparatus shown in FIG. 4; FIG.
FIG. 7 is a perspective view of a heat exchanger fin.
FIG. 8 is an explanatory view showing the entire manufacturing apparatus for manufacturing heat exchanger fins.
FIG. 9A is a schematic view of a conventional mold apparatus using a draw method.
(B) It is the elements on larger scale of a cut and raised slit.
FIG. 10 is a partial cross-sectional view for explaining the movement of the hitch feeder.
[Explanation of symbols]
10 Heat exchanger fins
11 Plate
12 Through hole
14 colors
15 Colored through hole
16 Container section
17 Flange
20 Thin plate
22 Uncoiler
24 pinch rolls
26 Oil applicator
27 Upper die set
28 Press equipment
29 Lower die set
30 Mold device
32 Feeder device
34 Stacker
36 First draw punch
42 Second draw punch
44 3rd draw punch
45 Fourth draw punch
46 Burling Punch
48 Piercing Punch
50 Pilot pin
52 Refire Punch
55 Pilot pin
56 Feed pin
59 Cut and raised slit
60 Feed hole
62 Piercing Hole
70 small hole
74 Pilot pin
76 Pilot pin
78 Ianing Punch
90 Piercing punch
91 small hole
92 Burling Punch
96 Tab processing pin
100 hitch feeder
102 Spring
104 Moving plate
110 Colored through-hole
111 Pilot pin
112 Pilot pin
114 forming punch
115 forming punch
116 cone
117 Container
118 Piercing Punch
120 ironing punch
121 ironing bush
122 Pilot pin
124 Pilot pin

Claims (4)

A through-hole with a collar on a thin metal plate that is intermittently transferred from one end side to the other end side between an upper die set and a lower die set, at least one of which is provided in the press device so as to be movable up and down. In the mold apparatus in which each of the steps of forming is sequentially provided in the transfer direction of the metal thin plate,
An upper die set and a lower die set are formed on an unprocessed metal thin plate previously fed to a predetermined position between the upper die set and the lower die set before the formation of the collared through hole. Drilling means for drilling the feed hole by closing the mold with
Feeding to the feed hole formed in the metal thin plate fed to the other end side of the mold apparatus using a feed apparatus provided on the other end side of the mold apparatus and attached to the press apparatus side. A transfer device capable of intermittently transferring a metal thin plate from one end side to the other end side of the mold device without using the feeding device when the pin is inserted ;
The drilling means is disposed between one end side of the mold device and the transfer device so as to be inserted into a through hole drilled in the metal thin plate and to position the metal thin plate; and It is a pilot pin whose tip is formed at a sharp tip so that the feed hole is drilled when a raw metal thin plate is fed and the upper die set and the lower die set are closed. A mold apparatus characterized by that. A piercing process for drilling a small hole in a thin metal plate and a burring process for burring the small hole with a burring punch are separate mold apparatuses,
When the upper die set and the lower die set are closed on the raw metal thin plate fed between the upper die set and the lower die set, the tip of the burring punch, The mold apparatus according to claim 1, wherein the mold apparatus is formed at a sharp tip so that the hole is formed . A through-hole with a collar is formed in a metal thin plate that is intermittently transferred from one end side to the other end side between an upper die set and a lower die set that are provided so that at least one of them can be moved up and down When manufacturing fins for heat exchangers by forming collar-shaped through holes in a metal thin plate by a mold device in which each of the forming steps is sequentially provided in the transfer direction of the metal thin plate,
A transfer device is provided on the other end side of the mold apparatus to insert a feed pin into a through-hole with a collar formed in a metal thin plate and intermittently transfer the thin plate in the direction of the other end side of the mold device. The tip of the pilot pin that is provided between one end of the mold device and the transfer device and is inserted into a through-hole formed in the metal thin plate and positions the metal thin plate is sharpened Using the mold device
After feeding a raw metal thin plate to a predetermined position between the upper die set and the lower die set in advance,
When the upper die set and the lower die set are closed to the raw metal thin plate fed between the upper die set and the lower die set, the pilot pin causes the transfer device to Drill a feed hole into which the feed pin is inserted,
The upper die set and the lower die set are closed, and a punched hole into which the feed pin of the transfer device is inserted is drilled in an unprocessed metal thin plate,
Next, while the upper die set and the lower die set are opened, a metal thin plate is fed using a feeding device mounted on the press device side, and the transfer device is fed into the perforation hole. Insert a pin to enable transfer of a thin metal plate,
Then, a through hole with a collar is formed while transferring a metal thin plate by a transfer device without using the infeed device. An upper die set and a lower die are preliminarily used using a mold apparatus in which a piercing process for drilling a small hole in a metal thin plate and a burring process for burring the small hole with a burring punch are provided in separate processes. When closing the mold between the upper die set and the lower die set on the raw metal thin plate fed between the set, the burring punch with the tip formed at the sharp tip, The manufacturing method of the fin for heat exchangers of Claim 3 which drills a drilling hole .

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