JPS60180633A - Ironing punch for forming flare of fin - Google Patents

Abstract

PURPOSE:To perform smoothly ironing and to prevent surely a crack of flare by forming the taper part and the ring part of a punch end into a continuously formed construction in forming the flare of a fin by an ironing punch. CONSTITUTION:A semispherical-shape predrawing is provided to the prescribed part of a fin P of hard material by a predrawing punch 14. Successively, a hole is pierced in the semispherical part of fin P by a drawing punch 11 functioning also as a piercing die and a piercing punch 14. Next, the pierced part is ironed between an ironing punch 17 and an ironing die-bush 18, to form a flare Pf. The most front end of punch 17 is rounded along its peripheral face, and is continuously connected to a taper part 30. The base part of taper part 30 is formed into a rounded ring part 31, which is continuously connected to a small-diameter stepped part 32. In this way, the generation of a crack of flare is prevented, because a contacting part between the flare Pf and the punch 17 is restricted only to the vertex of ring part 31.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to improvements in eyeloning punches necessary for forming flexible sheets when manufacturing fins for heat exchangers used, for example, in automobiles or air conditioners. .

[Technical background of the invention and its problems]

This type of fin is constructed by inserting a large number of flared through holes into a rectangular thin aluminum plate.The multiple plates of this fin are overlapped with each flared hole aligned, and steel pipes are inserted into these holes to integrate them. It forms a heat exchanger.

Incidentally, a soft fin material with a plate thickness of 0.12% was originally used as a fin material for heat exchangers used in automobiles or air conditioners. Taking advantage of the characteristics of this soft fin material, drawing processing is performed four to five times before flexible processing. However, in order to reduce the cost of the heat exchanger, the plate thickness is 0. Now uses IX's thin fin material. The material of this fin material must be made harder to compensate for the thinner plate thickness, and it is necessary to use a so-called hard fin material.

For hard fin materials, it is impossible to perform the same drawing process as for soft fin materials before flexible processing. Conventionally, in the first step, a fixed punch with a diameter smaller than the diameter of the predetermined flared through hole and a movable die that is compatible with the punch and has a built-in small diameter punching inch are used to punch a small vertical cylindrical shape than the predetermined flared through hole. A manufacturing method has been developed in which, in the second step, burring (extrusion) and eyeloning (ironing) are performed simultaneously using a fixed punch and a movable die of the same size as a predetermined flared through hole.

However, when eyeloning the flexible material in the heat exchanger fin, since the eyeloning punch is straight, smooth eyeloning is not performed and there is a problem in that the flare is likely to crack due to excessive tension.

[Purpose of the invention]

The present invention has been made in view of the above circumstances, and its purpose is to provide an eyeloning/gunch for flexible molding of fins that enables smooth eyeloning and reliably prevents flare cracking. It is something to do.

[Summary of the invention]

The present invention provides eyeloning for flare forming of fins in which eyeloning is performed at the end formed by consecutively connecting the tapered portion 77 portions.
It's an armpit.

[Embodiments of the invention] Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIG. 1 shows a first process state for a fin P made of a hard material. In the figure, reference numeral 1 denotes a pre-diaphragm one-arm inch, the end of which is formed in a hemispherical shape and protrudes from the upper surface of the lower mold grate 2. The base of the preliminary drawing punch 10 is supported by a first sliding plate 4 and a second sliding plate 5. The mating surfaces of the sliding plates 4.5 are inclined, and by sliding the second sliding plate 5, the amount of protrusion of the preliminary draw/yonch 1 from the upper surface of the lower die plate 2 can be adjusted. It looks like this. In this way, the lower mold 6 is constructed.

Further, the hole 8 provided in the preliminary drawing dia faces the end of the preliminary drawing 974/inch 1. Incidentally, the prep school kudai 7 constitutes the upper mold 1o.

By interposing the fin P between the lower die 6 and the upper die 1o and performing the first step of aligning the respective dies 6 and 1o, the preliminary drawing punch 1 and the hole 8, which are predetermined parts of the fin P, are There is a preliminary aperture that projects slightly upward in a hemispherical shape.

FIG. 2 shows the second process state for the fin P. Number 11 in the figure is the 9-inch Anameidai Maegyo shoes.

This perforated die front punch 11 constitutes the lower mold 6. Reference numeral 12 denotes a drawing die, and this hole portion 13 has a diameter larger than the diameter of the pre-drilling punch I'l by the thickness of the fin P, and is opposed to it. A punch 14 is housed along the axis of the hole 13 so as to be vertically movable.

This Anamei/Gunchi 14 is from Anamei Daimae! It can be fitted into a groove hole 15 provided along the axis of the punch II.

In this way, the upper mold 1
Configure 0.

Then, the fin P that has undergone the first step is interposed between the lower mold 6 and the upper mold 10 [7], and a second step is performed in which each mold 6° 10 is aligned. In the first step, the hemispherically curved portion is narrowed into a right cylindrical shape between the hole punch 1) and the hole 13, and a small diameter hole is bored in the center thereof. At this time, since preliminary drawing is performed, there is no thinning of the side wall portion due to excessive tension, and there is no cracking during flare forming, which will be described later.

FIG. 3 shows the third step for fi/P.

In the figure, reference numeral 17 denotes an eyeloning punch, which has dimensions constituting the lower die 6. I s u , I yoning die push fitted to I yoning dive-I shi & grate 1g. In the hole 20 of 18 for this eyeliner,
A knockout 21 is slidably housed. These Eyeloning Die Push 18. The eyeloning die push grate 19 and the knockout 21 constitute an upper mold 1.0.

Then, the fin P that has undergone the second step is interposed between the lower mold 6 and the upper mold IO, and a third step is performed in which the fins 6 and 10 are brought together. In the second step, the part 20, which is drawn into a vertical cylindrical shape and has a small diameter hole, is eyeloned between the eyeloning punch I7 and the hole 2o of the eyeloning die push 18, and the fin P has a predetermined height. A large flexible board Pf will be formed. Finally, the knockout 12 descends and knocks the fin P off the eyeloning die push plate I9 and the eyeloning die push plate I9.

FIG. 4 Hiro shows the state of the third step in detail. In other words, the eyeloning punch 17 is positioned on the eyeloning edge plate 23 and supported on the lower die set 24. A lubricating oil supply path 25 is provided in the lower die cast plate 24 and communicates with an oil inlet Z7a drilled along the axial direction of the eyeloning/9-inch I7. This oil filler 171L opens at the end face of the eyeing nozzle 17. The lower mold 6 is composed of the eyelon/nine inch 17, the eyelon plate 23, and the lower mold die set 24. In addition, the above Knockout 21
is elastically biased by a compression spring 28 housed in the hole 27 of the upper die set 26 so as to come into contact with the eyelon/4' inch 12 . In this way, Ioning Dye Push 19 and Ioning Dye Push 18
The upper die set 26 and the knockout 21 constitute the upper die 10.

When the upper die 10 and the lower die 6 are separated after eyeloning the fins P, the knockout 21 is urged by the compression spring 28 and slides through the hole 20 while contacting the end face of the eyeloning/nine inch 11. Therefore, Knockout 2I
can come into contact with the flexible Pf and brush it off.

Also, during eyeloning, the lubricating oil supply path 25 is filled with oil 17.
Lubricating oil is supplied along 1L to provide lubrication between the eyelon/4 inch 11 and the flexible plate Pf.

FIG. 5 shows a state in which holes 23h and 19m provided at the axes of the eyeloning/nine inch plate 23, eyeoning dive, and sea plate I9 are simultaneously machined.

That is, the axes of the eyeloning/nine inch 17 and the eyeloning dive bush 18 must be completely aligned.

If these are eccentric, a flexible plate Pf with uneven height will be formed, and this will cause flare cracks.

Eyeoning/4 inch I7 and eyeoning daiguzushi
181t, Since they are each fixed to the eyelon punch plate 23 and the eyeoning die plate plate 19, if these are stacked and the holes are machined at the same time, it will be possible to form the eyeball///1noa1no4-77)-
The axis line of the eye 1 and sea 18 will be completely aligned.

In addition, FIG. 6 shows the state in which the simultaneously machined eyeloning punch plate 23 and eyeloning die bushing plate 19 are attached to the lower die set, the bottom die set 24, and the upper die set 26. Holes 23*, 19 processed into these
Since the diameters m are the same, the guide pin 29 can be inserted and attached here.

7 shows the eyeloning punch 17, and FIG. 8 shows only the end of the eyeloning punch 12 in an enlarged manner. This tip end is formed to be rounded along the curved surface, and is further connected to the taper m30. The base of this chi flat part 30 is a rounded ring part 31, which is connected to a step part 32 having a smaller diameter.

First, the hole of the fin P is enlarged using the chi 8 part 30, and then the flexible plate P is eyeloned using the ring part 3. At this time, the contact between the flexible Pf and the eyeloning nozzle 17 is only at the apex of the ring portion 31, so it can be made small, and smooth eyeloning is performed without excessive tension, and there is no risk of flaring cracking. . Moreover, the lubricating oil is ejected from the end face of the oil filler 11a in accordance with the vertical stroke of the press and lubricates the eyeloning part.
There is no wear on the eyelon punch I7.

In the above embodiment, the portion of the fin P other than the flared portion Pf is flat, but the present invention is not limited to this, and as shown in FIGS. Good too. That is, as shown in FIG. 9, a wavy corrugated/4' inch 3 is provided on the upper surface of the lower mold grate 2, and a wavy corrugated molding die 9 is provided on the lower surface of the preliminary drawing die. Since the full-gate forming nokunchi 3 and the corrugate forming die 9 have the same shape, the circumference of the hemispherical preliminary drawing with respect to the fin P' during the first step becomes a waveform with a height of about 0.6 to 0.7X. A tensile drawing is performed. As shown in FIG. 10, the fins P' are located on the lower surface side of the drawing die 12 and are not displaced by the corrugated die 16 during the second step. Further, as shown in FIG. 11, a corrugated die 22 for positioning is provided on the lower surface of the ioning die butt plate 19. During the third step, the fin 7P'ld and the corrugated die 22 prevent positional displacement. Moreover, the fins P' on which the flexible plate Pf is formed have strength, and the heat exchange efficiency is improved. (Note that the same parts as in the above embodiment are given the same numbers and the explanation is omitted.) [Effects of the Invention] As explained above, according to the present invention, since the part to be eyeloned is the apex of the ring part, Smooth eyeloning is performed. At this time, since nothing other than the ring portion comes into contact with the already eyeloned portion of the flexible cable, it is possible to reliably prevent flare cracking due to excessive tension.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIGS. 1 to 3 are vertical cross-sectional views sequentially showing the manufacturing process of the fin, FIG. 4 is a vertical cross-sectional view showing the manufacturing process of FIG. 3 in detail, and FIG. Figure 6 is an explanatory diagram of the machining of the eyeloning punch plate and the eyeloning die butt plate, Figure 6 is an explanatory diagram of their installation, Figure 7 is a front view of the eyeloning punch, Figure 8 is a partially enlarged view, and 9 to 11 are vertical sectional views sequentially showing the manufacturing process of a fin showing another embodiment of the present invention. P...Fin, Pf...Flexible, 1...Preliminary drawing hole, 11...Die pre-proofing, 9 inch, 14.
... Anake no J? N-j-117...eyeoning punch, 30...chee/mother part, 3I...ring part. Applicant's representative Patent attorney Takehiko Suzue 11q Fig. 9 Kazuo Wakasugi, Commissioner of the Patent Office, Patent Application No. 59-36720 2, Title of invention Eyeoning Punch for Flare-shaped Fins 3, Case of Person Making Amendment Relationship with Special Contract Applicant (307) Toshiba Corporation 4, Agent Name changed on April 2, 1980 (all at once) 5, Voluntary amendment 7, Supplement - 10,000 contents (1) Specification @ 6 page 15 1 notch out on the first row 12”
iJ corrects it as "Knockout 21". (2) In the drawings, the code ``13'' in Figure 3 is corrected to r 7 g Jt 2 so that it is not placed in the attached drawing.

Claims (1)

[Claims] When molding a flexible material into a fin, the end of the
An eyeloning punch for flexible molding of fins, which has a continuous structure with a tapered part and a ring part, and is characterized by eyeloning using these parts.