HU229897B1 - Process for producing fins for heat exhangers and apparatus for carrying out this process - Google Patents

Abstract

The invention describes a process for producing fins for heat exchangers having openings and collars (4, 6) which surround the latter, wherein the collars (4, 6) are deep-rolled at a low temperature from the fins provided with pre-stamped openings (2) by means of a revolving tool (26), and also an apparatus for carrying out such a process. The process is characterized in particular in that the pre-stamped openings (2) are produced in a mould with a punch (22) and a die (20), wherein the die holding plate (14) holding the die (20) and the punch holding plate (16) holding the punch (22) are guided and positioned in relation to one another via direct guide elements (17, 18, 25).

Description

TECHNICAL AREA

FIELD OF THE INVENTION The present invention relates to a process for the production of plate heat exchangers and an apparatus for performing such a process. During the process, preferably in the first step, this portion of the fiber is woven or matted onto the collar.

TECHNICAL STATE

Air conditioners, power plants, and the like require the production of large quantities of sheet metal, which are threaded onto the conduits of the heat transfer medium. Because of the large number of pieces to be processed, the manufacturing of sheet metal strips and drawing them onto the conductor pipes must be carried out as rationally as possible, and practical material must be used at a favorable price. This means conflicting requirements. For the pulling of the collars around the ribs, which also serve as spacers between the ribs that are attached to one another, the most deformable material should be used.

Such a material, on the other hand, due to its high deformability, is unfavorable in further dilution and the finished heat exchangers will be very sensitive to mechanical influences. On the other hand, the cheaper material, which is harder rolled, which would be advantageous in terms of tightening the sheet covers to the tubes and the mechanical strength of the heat exchanger, can only be used if well-defined processes are employed; otherwise it is impossible to produce said collar sufficiently rationally.

CH 500783 describes a process which allows the use of a harder, shorter sheet or film without increasing the cost of production

2lemezbördákhoz. The down

The collars can be easily rolled and smoothed so that the plate ribs can be easily sewn to the rain you can choose big. The problem with the process, however, is that only collars of a given maximum height can be produced. In the process in question, it actually means that from a certain collar height, if not every case, if it is subsequently flared, too large s: for high flexibility, and for the tubes towards the plate; as large as possible, it is desirable to have a maximum ga

U.S. Patent No. 5,501,092 discloses a punch machine. It is an object of the invention to provide at the end of the invention; direct lubricant: lead to it. Sticker between the iyuk and in

are connected.

DISCLOSURE OF THE INVENTION

It is an object of the present invention to provide an improved process for making sheet metal ribs. Advantageously, a method is provided which enables the highest possible collars to be produced in a reliable manner without causing an unacceptable amount of debris due to the rupture of the fiber portion of the collars.

Specifically, it is an improvement of a method for producing ribs with holes and surrounding collars for heat exchangers, wherein the collars are typically formed from sheets with perforated holes, by means of a rotating agent number, in the form of a cold rotation, such as is described in

In the context of multidirectional development work to improve this process, and particularly in relation to the desired collar height increase, i.e., to increase the ratio of the collar inner diameter to the inside diameter of the previously pierced opening, a number of parameters were investigated. was pushed to the front, surprisingly during the glazing of the mountain

The tendency is not: it is only determined by the actual weaving process used to form the collar: but additionally, it is rather the pre-production of the opening. First and foremost, there must be an appropriate proportion between this open non-color cutting section. Kon) meadow: no part can have a significant predominance in any of the arrows surrounding the arrow. As soon as the hardening caused by the cooling or the non-coloring cut portion predominates in one of the portions of the aperture, the next shaping process to form the collar is likely to produce cracks that invade a high proportion of debris.

we tried the two parts of this mmer

Further, it is surprising that the problem can be solved by making the apertures in a die punch and die tooling and positioning the die holding plate and the individual. In other words they let u make the punching! During the process, the direct and direct fall locking of the two tools and the precision of the cutting slot associated with it can avoid the problems discussed above. It has become apparent that guiding two tools, such as a columnar rack, with additional modules normally mounted on a rack, is not accurate enough and the problems mentioned can only be avoided by directly guiding the two tools relative to one another during punching. .

The direct alignment of the matrix holder plate and the stamp holder plate also includes constructions in which the matrix holder plate is rigidly secured to one another and the stamp holder plate is rigidly secured to one another. Accordingly, the sticker holder on the sticker holder is located on a front module bracket on the base plate (a fall

Price may be fixed, or may be a floating bed stamp plate affixed to a second module on the other base plate. Or can be floating) and that the direct guides are either direct or the first module block relative to the gusset plate ς or positioned the first module block to the second module block

positioning or driving, or positioning.

According to a first preferred embodiment of the gait, there is a guide bar, preferably a plurality of guide columns, for example two guide columns located on the disk band. A. One of the guiding posts may be rigidly fixed in the stamp holder plate and the guide posts may be axially engraved in the guide aperture in the sticker holder plate, substantially without any play of alignment.

years, rigidly fixed and guided axially in the guide aperture in the stamp support plate, substantially without any play of fitting. It is also possible to combine these two different modes in the same tool.

In a further particularly preferred embodiment, the plate with the guide opening is provided with a floating bearing in the tool. this way, we ensure that the A's accuracy for women is maintained during long-term operation of the A, so it's fine-tuning settings and the like. Alternative m columns, or both panels can be heeled 17-21, the presets change at e O, the float bearing later becomes:

Brine

I, for example

Aluminum aluminum), AW1050 quality and I 9 hardness are particularly preferred. This material has an A50 rupture; it is expediently to elongate to about 3%, preferably 2%.

The sheet foam is preferably made of aluminum sheet having a thickness of 0.25-0.30 mm, preferably 0.28-0.28 mm,

According to a further preferred embodiment, the process preferably produces a collar starting from an opening having an internal diameter of 10-14 mm d3

de has an internal diameter of 1, b times larger, preferably 1.7 times larger than the inside diameter d3 of the orifice. This ratio can be 1.78. According to the state of the art and without the assembly of the tools described above For such materials, this value

1.55 or a maximum of 1.58 so that the process remains reliably blood.

One more? In a preferred embodiment, at the same time as the punching, the impression in the plate is created in a circumferential plane parallel to their plates having an outer diameter 42 greater than the inner diameter 44 of the collar and the recess being offset from the plate plane. The additional design of such an impression allows the plate fins to be pushed much more firmly onto the tubes and also has greater rigidity.

Punched openings may be punched before or after the recess is formed. Preferably, in the first step, the recess is produced, and in the next step, the perforated opening.

Another advantageous embodiment! According to mode 1, the recess may be formed in two separate machining steps, a pre-cavity step and a subsequent recess forming step, which serves as the starting point for the collar creation steps. step before or after step, but can also happen after the next step of shaping.

Preferably, the; the recess formed has a shape that has a perforated recess on the circumferential edge of the recess and this recess is surrounded by a bottom portion which is again slightly offset relative to the plate plane.

If the draw! step on the whistle! we do it in the same direction as the recess at the end, then the retraction! Preferably, in step a, an annular recess may be formed having a height greater than the height of this circular recess after the next shaping step. Preferably, in step a, a recess is formed, which in the next forming step is slightly re-skewed towards the plate plane.

moving a portion of the wood from the plate in the direction of symmetry of the collar in the direction of the final cavity in the step of forming the gaseous cell, which may or may not precede the creation of the hole, to a certain extent bounce back from the plate. In doing so, a wave of such a diameter is formed. greater than the outer diameter of the recess, serves as a point mt <sa. so can we put ro ben material into the defining parts, which makes for even higher collars? possible.

It may be advantageous, if using a method of creating a circular recess or creating a wave in the opposite direction, to create a central cavity, i.e., a recess symmetrically formed about the axis of symmetry.

the gold plated from the plate plane is preferably opposed to that

In addition, the collar is made in the longitudinal position with the water folded in a donut.

According to a further preferred embodiment, the collar is produced with a mangrove stamp having 3 to 8, preferably 5 symmetrically placed mangrove balls, wherein the lower top points preferably have a diameter smaller than or equal to the inside diameter of the opening. For example, if the diameter of the lower peaks is smaller or equal to the inside diameter of the orifice, it may be unnecessary, for example, to preform the machining part, as illustrated in Figures 1, 3, 3, 3, 3, 3; or 1, h3). The ball balls may be rotatably held in the ball stamp, or preferably be soldered or soldered.

A preferred embodiment of the proposed process is characterized by the fact that the collar is superimposed on the plate plane.

, preferably 0.03 ™

0.07 mm smaller. In other words, it has surprisingly been found that, with the careful design of the perforated opening, it is also possible to stretch the collar and stretch to create a collar height as large as

..

without the plate fin for the windward heat exchanger produced by the procedure described above. Such a sheet rib is preferably of 0.25-0.32 mm or 0.250.30 mm thick, 17-21, preferably 1B to 20 Brinell hardness, preferably 1-3%, preferably 2%, of A50 tear elongation in aluminum sheet. Further, such a sheet fin preferably has a collar height hl (pre-flange height such as hl shown in Figure 1) having a height greater than 3.5 mm, preferably greater than 3.9 mm, and an inner diameter d4 18-19 mm, The typical hl height achieved by the recommended method is 4.4-4.6 m

The invention further relates to an apparatus for carrying out the above-described process, that is, for producing the described sheet rib; The apparatus comprises, preferably, at least one module for punching arrowheads and one.

thereafter, the tool for making the holes has a punch punch and a sticker, and a sticker holding plate and a punching punch holding plate, which have direct guides and positioning.

In a preferred embodiment of such a device, the guide rails have at least one, preferably more, guide columns which are rigidly secured in the stamping plate and guided axially in the guide opening in the muffle plate essentially without a play or and guided axially in the guide aperture in the tile holder plate, substantially without a play of fitting. Advantageously, the plate with the guide aperture in the tool is for mounting ace. Those further advantages described above with the device

yan is a guide element which may or may not be a section of columnar wheels, but which may be made of modular plates which hold these sheets correctly, ie the locking is maintained throughout the process. But you can also lock it together in just a short while! before the process ~ s ~ it. so it makes sense, of course; construction is also a guide element, whereby the elements to be fastened together, for example by means of a groove / rib or cam / groove, are always assembled just before the elements meet

Basically, the two versions of interlocking - "under full stroke" and "always; intermediate stages are only possible, for example, a variant in which the assembly is only lifted shortly before the top dead center (for example between 35CT and 1 £ P).

Also included are constructions in which a smaller opening is first formed in the sheet to be machined and then used to provide optimum positioning between the two tools, for example, by the positioning element being absorbed by one or both of the tools. .

Advantageously, such a device is particularly characterized by a punch module and a module for cold rolling and optionally further modules which are bubblers. They are used for the production of flakes, flanges and partitions, placed on a common columnar rack * which is covered by a strip of strips, the sheets of which are glazed properly coordinated with the forward movement of the strip.

DESCRIPTION OF ID

Hereinafter, preferred embodiments of the invention will be described with reference to the drawings, which are provided for purposes of understanding only and are not to be construed as limiting. In the drawings, each of the drawings illustrates:

Fig. 1 shows a sectional view of some of the sections subjected to forming during the processing of the carrier plate in a columnar rack, Fig. A) in a turbulent section, Fig. B) a perforated hole with axial embossing, ao) Fig. 1) illustrates an axial section of a plate with a flared collar: Figures e1) to e3) illustrate the process in three steps when starting from a planar plate (not shown) in Figs.

X

Before step 4, an alternative shape with a central borehole recess is created and the punching is directly done. step; Figures f1) -13) illustrate the process in three steps in the case of a planar plate: (not shown) starting from step c) and d) of steps 3 and 4 of Figs. d) and another alternative embodiment with a central circumferential recess. a shape is formed and the puncture occurs immediately after the complete recess is formed, i.e., Í2); Figures g1) to g3 illustrate the process in three steps: when starting from a planar plate (not shown) prior to steps c) and d) in steps 3 and 4 in the opposite direction, and a further alternative embodiment is provided with a central aspiration recess and the punching is performed immediately after the forming step g1) in the opposite direction; Figures h1) to h3) illustrate the process in three steps when starting from a planar plate (not shown) prior to steps c) and d) of steps c) and d), respectively, having undergone an with a puncture recess: a further alternative embodiment is provided and the puncture is only made after the complete recess is formed, i.e. after step h2); Figure i) illustrates the possibility that a variant may have a central protuberance after e) and f); Fig. k) illustrates the possibility that after a variant g) or h), in a variant, a central protrusion may be formed; and finally, the bow figure shows the part where you can

Lerna; the

Figure 2; Fig. a) illustrates the whole column, Figures b) illustrate a punching module of slightly different construction than Fig. a), namely Fig. bt) with the piercing module open on the left and closed on the right Fig. 2b is a plan view of the upper part of the punch module, Fig. b3 is a top view of the bottom part of the punch module and Fig. h4 is a perspective view of the punch module folded open. in addition, additional modules not illustrated herein may be provided, for example, to perform the steps that will be described with reference to Figure (e) -1.k);

Figure 3; the piercing module shows a) a section without a guide post, Figure b) shows a guide post

- illustrates 10 sections in section, and illustrates sections of the etch s and g in enlarged detail:

Fig. 4 is a sectional view of Fig. A) and a top view of Fig. B) illustrates an axial section of the layout of a paperclip and its associated vignette; Fig. D) shows a sectional view of the vignette stamp and and Fig. e) shows an enlarged detail of the gap between the mandibular and the vignette in the case of a stretched plate; and finally it is

Figure 5; Figure (a) illustrates the full edge of the flange stamp, while Figure (b) shows the front of the flange stamp,

DESCRIPTION OF THE PREFERRED EMBODIMENTS

Figure 1 shows different views of a plate for a heat exchanger taken during the various process steps described below. Fig. 1 a) is a longitudinal section illustrating a turbulator formed in the first step from a plate. They are essentially elongated recesses or ribs (optionally with lateral slots), which are formed around the actual collars 4 in order to increase the surface and increase heat exchange accordingly.

Fig. 1, b shows an axial sectional view of the plate 1 taken at the second workstation of the process after passing through, i.e., after forming a perforated hole 2 with a diameter d3 in the plate 1 and a depression 3 at the same time The recess 3 moves the portion around the hole 2 of the plate 1 in a plane perpendicular to their original plates. Offset Outside diameter is literally a word

d2, with an inner diameter in the range of mm, and an outer diameter of the outer diameter d2 of 23-24 mm in the range of 11-12 mm.

In Fig. 1.0}, a portion of the disc 1 around the collar opening is shown in an axial section taken after passing through the third work station. The collar 4, in the opposite direction of the recess 3, is drawn on the other side of the plate 1 beyond the plate 1: it is deeply drawn across it to form an upper edge 5.

collar. The inner diameter of the collar 4 is indicated in the figure by d4, and its size is in the range of 18-19 mm in accordance with the dimensioning herein. Such a collar 4 has, for example, a height of 3.9 mm to 4.6 mm and is indicated by h1 in Figure 1c. In other words, it has a buckle to the inside;

the collar 4 is formed by the collar 5 a 4 in which the plate 1 is formed by the recess 3 and upwards by the collar 3 which protrudes far from the opposite side.

1, d is an axial sectional view of a collar aperture on the fourth mandrel. It is flanged at the top of the neg, so that 7 flanges are bent. The outer diameter of the rod, in accordance with the dimensions given above, is typically about 21 mm, and thus the height of the flared collar 6 is ultimately about

3.1 mm (denoted by h2 in Figure I.d), the height h2 is ultimately responsible for the clearance between the plates on the tubes to which the sheet metal ribs are pulled towards

: S ~ is not absolutely necessary, but it is optimal for positioning the ribs on the tubes.

In the process, starting from the step plate of Figure 1 b) ~ 1 d), the central collar 2 is first pierced in the area of the future collar 4 and then the recess 3 is formed in a forming process before the next steps 3 and 4 we create the flared 4 collar. In carrying out such a process, the final maximum height h 2 depends to a great extent on the method chosen in the so-called shaped part 49, which is indicated in circular form in Fig. 1.1), in order to obtain a more even distribution of material thickness. In addition, the process must be directed so as to obtain the smallest radii of curvature and a procedure is performed to reduce the risk of cracks in the area of the collar 4, as stated above, 3.1.

typically

We can increase it to 3.6-3.8mm without producing the like.

with which to control.

respectively, to obtain the excavation state of Figures 1c) and 1c, d), a first pre-drawing is made of ~ 12 1 plates (initial state not shown) adjacent to the non-forming part of the 3 recesses outside the recess has a recess 41 extending around its periphery. In other words, after this first drawing, the plate 1 has a shape such that the outermost con portion of the recess 3 has a circumferential recess 41. which passes through 45 transition portions to the unmoulded portion. Shifted inward relative to the axis of symmetry 43, there follows a slightly higher (i.e., again offset to the plate) circular base 42. The recess 41 passes through this transition portion 44 to this bottom 42,

The height H1 of the circumferential recess 41 for the above dimensions of total height b1 and h2, H1 0, 0.8-1.0 mm In any case, the height H1 must be greater than the height H2 analyzed below. Typically, they are at least 5% higher than H2 height, preferably at least 10%, more preferably at least 20% or 30% higher than H2 height. First draw of this! The result of step 1 is shown in section in Figure 1.e1).

In the embodiment of Fig. 1e, the next step is to punch the central hole 2, the result of which is shown in section in Fig. 1e2.

Then, a second forming step is carried out in which the recess 3 is slightly restored to a certain extent, namely by lowering the height H1 to the final result H2 as shown in Fig. T.e3) by applying pressure to the circumference of the recess 41. This height H2 shall be H2 ≤ 0,7-0,9 mm for the dimensions hl and h2 given above,

Steps e2) and e3) may be combined in a single tool stepAnother alternative process flow is illustrated in Figures 1, f1) to 1.f3). This process is in principle analogous to the thread e1) to e3), but the central hole 2 is only pierced after the second forming step, i.e. the pre-drawing (the result is shown in Figure 1fi) is followed by a second forming step (the 142}) and only afterwards the central punched hole 2 is formed.

13 can put a single tool in place The maximal reach of the jaw can be assumed to be maximal, in addition to the steps already described in Figure 1.b) -1, d), the procedure steps e) and f) are possible. As shown in Figs. 1, e) and I.f), in a blister step, a circular recess 41 'is inserted into plate 1. This recess 41 is formed before the collar 4 is angled to give the appropriate contour. In this case, the outline of the silica, A, is shown in Figure 2

after formation (see 1, e); fired out (see 1 .f) á In both versions, I have things to do, like the final H2 height. The advantage of the ej version lies in the fact that it may produce smaller rays: the danger of gallerres and the production of rocks. In addition, in the case of variant f), the advantage of the pre-drawn height H1 is now greater than 3; version f) nagasabh Here's another: a 48 out of 4 collar other (compare 1.1). This modification facilitates the production of smaller edges, the material being thinned to some extent at the deepest point (lower peak) of this mesh. Due to the fact that in the next forming step, we are pressed at this point: working, that is, pressing , ensure that the mead no longer has a uniform distribution of material in the formed part 49 By not creating the hole 2 only in the first step, but only after the recess 3 has been formed, it is even possible to obtain more material can be made available, and obviously higher pitch height is required.

For the process, a further embodiment is illustrated in Figure 1, g).

of this further embodiment in the counties

for maturation 3 and 4 according to Figures 1, c) and 1d), respectively, a) a first preforming juice:

required initial state e va (initial state is not finalized in disk 1)

In a direction, we create a circumferential wave 46. This circumferential wave 46 is formed outwardly of the shaped portion 49 to be formed and serves, inter alia, to a certain extent radially outwardly to release as much material as possible to form a higher collar 4. In other words, in a first retraction step, the result of which is illustrated in FIG. 1, g1), a coring wave 46 is formed in the direction opposite to the future recess 3; the wave 46 at its apex has a diameter D1 around the axis of symmetry 43. This is larger than the additional circumference of the final circumferential recess 41 which is used to make the collar 4.

Dl diameter

Wkal or its capital may be produced

Semin!

preferably at least 10 or A, as shown in Figure 1g2), and then, in a further forming step, the actual recess 3 may be formed. The result of this step is the condition 1, g3). At the deepest point of the circumferential recess 41, starting from the condition 1, g3), then the collar 1 .cl and 1d) and the? to create edges.

Steps g2) and g3) can be combined in a single tool juice

Another alternative process flow is illustrated in Figure 1h); Here, we punch only after the recess 3 has been formed. Here, steps h2) and h3) can also be combined in one tool step.

In this process, as in Figures le) and 1f), it is utilized, among other things, to work the area of maximum material thinning at the top of the wave 46 with subsequent pressure, in this case material displacement, on the other hand. after all, eat as much as possible! coal, to reach 49 in accordance with Fig. Uj before part 1, break it back in such a way as to distinguish the appropriate toads:

Thus, during k, val as shown in Figures 1, gj and 1 .h): accepts 48 "waves". These 46 waves are the roar of the 4 collars

- 15a. The wave 46 is tolerated after the hole 2 is pierced (see figure tg);

b. The wave 46 is broken before the hole 2 is pierced (see Figure 1h).

In both variants, care must be taken that the diameter D1 must be greater than the final diameter D2.

The advantage of variant g) is the possibility that smaller rays can be formed, while the variant h t further reduces the risk of suture cracks and allows the production of higher collars 4,

In addition, in variant h), along with the wave 46, an additional protuberance 48 is embossed, whereby the hole 2 is then punched in order to warp the collar 4 (see Figure 1k). This modification also facilitates the production of smaller curvature radii.

Variants (e) and (f) are usually easier to transfer to the tool, variants (g) and (h) have the advantage that the "shaped 49; the material will have an even distribution of thickness (see Figure 1.1),

Compared to the solutions illustrated in Figures 1, b, the additional collar height typically can be further increased by 0.3-0.4 mm by the additional application of the procedures of e>

In all variants, the wave 48 and the circumferential recess 41 on its mandrel may either be stanodized before or after the stubble (see Fig. 1a).

In general, the design of the turbochargers may not only occur, as will be illustrated below, in the same workplace prior to the formation of the collars 4, but also, for example, in a separate workstation or after a brain workstation. if it gives an advantage in terms of tool design. According to a preferred embodiment, it is also possible that the turbulator bar is lowered before the collar 4 is produced (Fig. 1 (o)) and after the recess 3 is made.

In addition, in general, so-called search holes can be used to provide accurate process flow. These are perforated holes that are used to accurately position the disc piece during the flow process. Preferably, in the process described herein, such search holes are applied to portions where the holes 2 are then formed. Figure 2 illustrates a complete tool for making such sheet ribs. A disk track in the transport direction shown by an arrow is working hard: the autumn sheet, which is on a column> pos

such a schematically pseudo-number of jobs is provided by a lower base 8 salt and a lower base 9 being slidably held. The 10 columns led. The two base plates 8, 9 are guided periodically down and up during the process and, when the two base plates 8, 9 are selected, the plate band is moved to the right by one unit in a co-ordinated manner, thereby dropping to the next machining step.

Each machining step is identified by circular numbers and is described in detail below:

In the machining step ©, the turntables are stripped out of the strip and formed in this strip. This machining step results in a larger number of turbulators as shown in Fig. 1a.

In the second machining step 0, the holes described above and illustrated in Fig. 1b) are punched out and at the same time the recess 3 is embossed. The individual components of this module are described in detail below. In any case, in this module, the upper base plate 8 is first provided with a stamp holding plate 18 and holding a pull-out sheet 18 movable thereon. In addition to the plate strip, the holding plate 18 has four guide posts 17 passing through the loading plate 15. and the scraper 15 is held movably.

Attached to the lower base plate 9 of the columnar rack is the module module 13 and guide holes 18 are provided for direct positioning of the matrix retainer plate 14, the matrix retainer plate 14, and the stamp holder plate 13 and the matrix holder plate 13. This module, illustrated in part in Figure 2b, will be described in more detail later.

the working step is the step of forming the actual collar 4 in a spinning braiding process or stretching process, and the final result is the shape illustrated in Figure 1e). In this step, the stamping stamps 28 pass through said holes 2 and the edge portion thereof is turned into a collar 4 by a cold drawing process. During this penetration, the mangrove pans 28 turn several times around their own axis so that the collar 4 is rotated about its own axis twice, typically during the formation of the collar 4.

pushed 4 gellers to the top edge

1, d, as shown in Fig. 1, d), is separated by longitudinal sections of a fifth Φ machining step, and then the

(S)) in a neat step. and finally separating it in the finishing step (7)

The hole punch module illustrated in Figure 2 a) has four guide posts 17. Figure 2b illustrates a slightly modified puncture module having two guide posts 17. one on each side of the guided disc track. Fig. Fii is a cross-sectional view, illustrated on the left and open color on the right, showing how the matrix sheet 14 follows from the bottom upwards after the lower punch module 3. In this decal sheet, nests 19 and 20 are placed, as is described in detail below with reference to FIG.

At the top of the upper tool part is the upper punching module 13 '! a module block, followed by a stamping plate 18, in which hole punched stamps 22 and bushes 23 are placed (also described in more detail below in connection with FIG. 3), and finally a stripping sheet 15. The circular hole! discs in this embodiment are provided in the die opening plate 38 in the sticker holder plate 14 and directly below the lower punch module 13. The ejector apertures 38 may be provided with a slider structure below to guide the process.

a 22 hole

the wheel too. These central bores are provided with periodically or continuously controlled compressed air. This is particularly evident in the top view of the upper part of the tool in Figure 2.b2). Through a compressed hedgehog connector, it is introduced into a system of compressed air lines 39, which supply compressed air to each half of the tool, respectively. blow off the punching! To compensate for the pressure drop, it may be advantageous if only the external punching tools are provided with a valve arrangement in order to prevent the central air ducts from being pressurized too low.

As previously described, the puncture module in this case has only two guide rails 17, as shown in Figures a b1) and b2). The two guide columns 17 extend into corresponding guide openings 18, as shown mainly in Figs. guides 40 disposed on the scraper side are guided from the tab 18 and the upper module block side 13 '.

Figure 3 is a detailed sectional view of the ramming machine, i.e. the machining step ® described above. Specifically, Fig. 3.a) is a sectional view. and in particular that the lower base plate 9 is provided with the punch module 13 in this section first. On this module block is placed the mathematical support sheet 14; the snapper plate 14 is not rigidly mounted on the punch module 13, but with a floating bearing: In the positions defined within the snapper bar 14, a nest 19 is first provided for the actual die 20; the nest 19 is a circular element having the actual sticker 20 on its inside and rigidly pressed into it. The elements 19, 29 are rigidly connected to the sticker holder and cannot move relative to one another. The sticker 20 is pushed downward in relation to the top, and the woody panel 19 has a side 19

The inside edge of the ISO lake is slightly rounded slightly, This offset is the result of the cooking of 2 holes in the area of the 3 holes described above,

The upper punching module 13 ', viewed from above and downwards, is first provided with a stamp retaining plate 16. The fastening of the stamp retaining plate 16 will be described in detail below with reference to Fig. 3, b). The punching sheet 16 rigidly engages embossing sleeves 23 which are formed as cylindrical elements and which, in the interior, have the perforated punches 22. is also fixed

These embossing sleeves 23 have a flapper 15 disposed off-center and adjacent to the sleeve-sleeve flaps 23 when the tool is opened with this downwardly flanged molding tool, this IS flap remaining in contact with the plate 22 so that the flap 22 the mating sleeve independently moves upwardly and out of the plate 1 so that the plate 1 can be separated from the punching horn and then moved freely.

As shown in Fig. 3b, the puncture tool has a plurality of guides in the form of guide columns 17, which are provided with 17-way collars, or positioning sleeves 25, in a rigid flange bearing plate. The drawing board 16 can be moved on these guide posts 17. The sticker holding plate 14 has positioning sleeves 25, itlefve guide sleeves and a guide opening 18 for the guide column 17. The sticker holder sheet has a floating bearing on the upper side of the punch module 13 and accordingly the sticker holder sheet 14

The stamp holder plate 15 is not fixed to the upper bearing 13, so that the upper 13 'of the columnar rack, or the punching module 13, and the relative ridge plate 16 and 16 can be adjusted during the guide division process. that the cold forming is not a sliding groove along the perimeter of the opening, but that floating la and underside of the base plate eats the 14 m VAT extremely, and that

divided by optsmahs

Specifically, such a punching device, as illustrated in Figure 3c), typically has a cut gap of 0.025 mm (Figure 3c). marked). As long as the tolerance of such a device is about ± 10 micrometers without the aforementioned guide columns, this tolerance can be reduced to ± 5 micrometers by the interlocking of the two tool sections. This means that d? increasing the accuracy in the cutting slot from about 50 percent to about 20 percent, and accordingly ly; can ensure optimal design of the cutting edge.

you will see a mangrove stamp 23 that wins the application. A .26 mangoes

machining, and allows it to get around its axis, typically three in circumference, which rotates the mangrove stamp 26 with a suitable tool during the crushing movement, symmetrically distributed along the mangrove stamp 28, 2? is placed in a mangrove. The diameter d9 of the ball balls 5 is typically about 5.5 to 5.7 mm. The outside diameter d11 of the outer ball line of the five ball balls corresponds to the inside diameter of the created collar 4. At the wall surface there is an additional 30 balls which protrude beyond the leading edge of the ball balls. and 27 mt

Ielmere

As shown in Fig. 4, cj, the lamb stamp 28 functions in a cubic manner. The inner diameter d12 of the sticker 31 is selected such that the tip, as illustrated in Figure 4d) and enlarged in detail, is typically larger than the outer diameter of the mandrel stamp 28 and the corresponding material thickness of the sheet 1 so that the collar 4 and the die 31 of the tool remains dl 3 in the play (Fig. 4d). This fitting game is typically smaller than 0.81mm or smaller than 8.1mm.

However, it is also possible that, as illustrated in Fig. 4, e), this collar portion is not simply deep-drawn but actually stretched, i.e. the machining slot is smaller than the material thickness so that not only deformation occurs but at the same time stretching as well. Accordingly, to some extent, a negative matching game d14 is created, as indicated schematically in Figure 4e); this negative play d? 4 is chosen such that the gap at 0.25 mm material thickness is approximately 0.05 mm smaller than the material iron. FIG. 5 illustrates the flange stamp 32 used in the fourth machining position. The flange die has a stalk 34 having a large diameter d18 and a tip 33 or an inlet portion 33 having a smaller diameter. The tip portion 33 is angled at its apex and passes through a flange curvature 35 of the stem portion. The flange stamp 33 penetrates the collar 4 with its portion 33 and inverts the upper edge of the collar 4 in the radius portion R, so that a shape is formed. .d).

Claims (14)

Claims A method for producing plate ribs for heat exchangers with openings and surrounding collars (4.8), the method comprising punching a hole (2) in a plate and then cold turning the periphery of the hole (2) with a rotary tool (28) to a collar (4,8). formulated. characterized in that the holes (2) are formed in a tool with punch punch (22) and mephrio (20), and the sealing sheet (18) holding the punch (20) and the sealing sheet (18) holding the punch punch (22) (17, IS 28) and position it, Method according to claim 1, characterized in that the guide element (17, 18, 25) is at least one. preferably there are a plurality of guide columns (17) rigidly secured to one of the guiding posts (16) or a first punched module (13 ^! ) joined thereto, and a second punching module (13} connected to the die sheet (14)). or, alternatively, the guiding lugs (17) are rigidly fixed in the matrix retaining plate (14), respectively, in the second slider (13), and in the stamping sheet (18), respectively. in a first hole punch module (13b included in a guide hole (18), guided axially, essentially without a match play. Claim 2 is a histological process, characterized in that the mafrioattera tuft (14) or flap retaining plate (14) provided with the guide piercer (18) and / or the matrix retaining flap (14) or flap retaining sheet (16) provided with the guide flaps (17) Method according to one of the preceding claims. characterized in that the stamp-forming bar (18) is mounted on a first base plate (8) of a columnar stand, the mairicidal plate (14) is mounted on a second base plate (9) of the columnar stand and the first base plate ISI and the second base plate (9) ) (11) are displaceable relative to one another due to the protrusions (11) protruding and guiding them. Method according to one of the preceding claims, characterized in that the sheet rib has a Brineil hardness of 17-21, preferably 18-29, and an A50 elongation of 1-3 '%, preferably 2%, made of aluminum sheet, and the sheet rib 0.2259.30 mm or 0.25-0.32 mm, preferably 0.26-0.28 mm thick aluminum luminous sheet, and starting from the inner diameter td3> of the hole (2) 10-14, a collar | 41 having an inside diameter (041 1, 6 times. preferably 1.7 times larger than the hole (21 internal diameter (03 r A method according to any one of the preceding claims, characterized in that, at the same time as the punching, the embossment is formed in the plate (1) by a dovetail around the hole (2). in the form of a parallel recess (3) having an outer diameter (d2) greater than the collar (41) (4), and the recess (31) displaced from their plates in a direction opposite to the collar (4). 7, One of the preceding claims! method, characterized in that the collar? After making (4), the upper edge (51) of the collar (4; Method according to one of the preceding claims, characterized in that the collar (4j) is made with a chamois (128) having 3, preferably 5 (12) symmetrically arranged chamfer balls and a diameter (d10) of the lower points. ) is preferably smaller, equal to or larger than the inside diameter of the hole (2). 9. According to one of the preceding Claims; A method, characterized in that the collar (4) is produced by a mandrel stamp (28) having an outer diameter (dl 1) of Ό v \ skP? 'xc; v \ o '' fe s' · _K < a. to make this tool gap smaller, preferably 0.03 -0.07 mm smaller than the thickness of the sheet (1) to be processed Method according to one of the preceding claims, characterized in that the die holding plate (14) holding the die (20) is fixed on a first punching module (13 ') and / or the stamp holding plate (shooting) holding the punching punch (22) on a second punching module. (13) is fixed and the first guide holes (17, 18, .28) are guided or positioned with respect to the first hole punch module (13 ') relative to the tongue support plate (18) or the first hole punch module (13') guiding or positioning a second blocking module (13), or guiding or positioning the sticker holding plate (14) with respect to the second hole punch (13). 11. Apparatus 1-10. A method according to any one of claims 1 to 3, wherein the device comprises at least one means for punching holes (2) and one. a module inserted therein for producing a cold collar (4, 6) of the collar (4, 6), characterized in that the tool for producing the holes (2) has a punch punch (22) and a die (2) and a die (14). , which holds the sticker (28) and a stamp holder (16) holding the punch punch (22). In addition, the perforated punching modules (13, 133) have direct guides (17, 18, z) which guide and position the die holder and stamp pads (14, 16), and the punch pad (Ίο) is a columnar stand. mounted on its first base plate (8), and the mat support plate (14) mounted on the second base plate (9) of the columnar stand, and extending into the guide sleeves (11) of the first base plate (8) and the second base plate (81): (10) can be shifted relative to one another. Device according to claim 11, characterized in that the &lt; RTI ID = 0.0 &gt; guiding &lt; / RTI &gt; element (17, 18, 20) is at least one, preferably more, guide post (17) or guide rail which is rigidly secured to being guided axially in the guide aperture (18) in the mat holder holder (14) substantially without a play of fit, or alternatively they are rigidly fixed in the mat holder holder (1: 4) and axially engaging in the guide knife (16) are led without, 13. Brush device according to claim 12, characterized in that the plates having a lead ás8) are p4. 16) and / or plates provided with columns (17) for mounting in the tool. 14. Is one of the claims 11 to 13 a nonsense device characterized in that the punch module? 13? and a slave module for cold-harvesting and more! modules for making turbochargers, for embossing: for perolization and partitioning, placed on a common columnar rack: on which a plate strip is guided: and the columnar baseplates {§, 9) in a periodically coordinated downward movement in accordance with the outward movement of that strip. are led