EP2842653A1 - Tool and method for the production of stamped parts - Google Patents

Abstract

The invention relates to a tool and a method for producing stamped parts, in particular slats, having an upper part (7) and a lower part (8), which has at least one punching or fineblanking step (9) for cutting the outer and inner contour (2,4 ) of a lamellar blank (13) and at least one corrugation and embossing step (10) for corrugating the lamellar blank (13) and embossing of the burrs (15) formed during cutting, the corrugation and embossing step (10) being formed in a die top part (17 The invention has for its object to provide a tool and a method for producing corrugated fins, with which it is possible, the shape and dimensional accuracy and the sharp edge of the external teeth of the corrugated fins with simultaneous reduction of Increase costs. This object is achieved in that the upper die part (17) has an embossing bell (19), a scraper ring (20) provided with an embossing surface (40) with a corrugated profile (39) on the embossing surface (40) and an internal embossing (21) and the Die lower part (18) comprises an embossing team (32) with a wave profile (46) on its embossing surface (45), wherein the embossing bell (19) and the inner embossing (21) are each provided with an embossing shoulder (38, 42) facing the Wave profile (39) of the scraper ring (21) in the stroke direction (H) are arranged so that they can detect the burrs (15) only after the waves, so that the waves leading the ridge embossing and the outer and inner contour (2,4) the lamella can not change its position, but can change its shape on the ridge side (48) after the waves.

Description

The invention relates to a tool for producing stamped parts, in particular slats, with an upper part and a lower part, which at least one punching or fine blanking stage for cutting the inner and outer contour of a lamella blank and at least one corrugation and embossing stage for waves of the lamella blank and embossing form the burrs formed during cutting on the lamella blank, wherein the corrugation and embossing step is divided into a lower die part and a Gesenkoberteil.

The invention further relates to a method for producing stamped parts, in particular slats, in which the outer and inner contour of a slat blank in a first method step from a strip of tape within a tool comprising a top and bottom part in cut a punching or fineblanking, the finely cut lamellar blank is moved by a cross slide after opening the tool in a corrugation and embossing stage in which the lamella blank receives after closing the tool in a second process step by forming on a die top and a die base a wave profile and the burrs produced during fineblanking are embossed on the lamella, wherein the first and the second method step are carried out in one stroke.

State of the art

From the DE 10 2010 028 280 A1 a method and an apparatus for producing corrugated fins in two process steps is known, wherein a workpiece is punched or finely cut in the first process step, transported between the first and the second process step and corrugated in the second process step and simultaneously deburred. The process is carried out with a two-stage tool whose first stage is designed as a fineblanking stage and the second stage as embossing and corrugation stage.
When fineblanking typically creates a feeder, which increases in particular with decreasing corner radius and increasing sheet thickness. The insertion depth can be approx. 20% and the feed width about 30% of the sheet thickness or more (see DIN 3345, fineblanking, Aug. 1980), so that a lack of sharp edges on the outer teeth of the Slats can lead to a limitation of the part function.
In addition, the deformation of the thin and flat blade blank in the Well stage leads to a delay that affects the dimensional accuracy of the outer and inner contour, especially the shape and dimensional accuracy of the outer teeth of the blade, whereby the installation and functional properties are adversely affected. Elaborate rework is then the result.

Furthermore, in the DE 196 08 551 A1 a method for producing stamped parts, in particular flat lamellae described in which in a first method step, the workpiece is punched within a device from the raw material and spent after stamping by means also accommodated in the device transfer tongs in an embossing step, in which the burr the lamella is embossed. This prior art has the disadvantage that the burr embossed blade in an additional processing stage-such as in the EP 1 128 081 B1 must be waved, which significantly increases the effort and cost in manufacturing.

task

In this prior art, the present invention seeks to provide a tool and a method for producing corrugated fins, with which it It is possible to increase the dimensional accuracy and sharpness of the external teeth of the corrugated fins while reducing costs.

This object is achieved by a tool of the aforementioned type with the features of claim 1 and by a method having features of claim 14.

Advantageous embodiments of the tool and the method are the dependent claims.

The solution according to the invention is based on the knowledge that the waves do not run simultaneously with respect to the embossing of the cutting burr, but with a time lead in order to fix and not influence the outer and inner contours of the blade during the corrugation in order to ensure the dimensional and dimensional accuracy.

This is achieved in that the upper die part comprises an embossing bell, a scraper ring provided with an embossing surface with a wave profile on the embossing surface and an inner mold embossing (as well as the die lower part a Prägeambos with a wave profile on its embossing surface, wherein the embossing bell and the inner mold embossing each with an embossing shoulder are provided, which are arranged opposite to the wave profile of the scraper ring in the stroke direction so that they can detect the burrs after the waves, so that the waves leading the ridge embossing and the outer and inner contour of the lamella not their position, but their shape on the ridge side after which waves can change.

It is particularly advantageous that the embossing bell for fixing the outer contour of the lamellar blank is annular and the outer contour completely encloses, and that the inner mold embossing is arranged supportingly against the inner contour.
The outer and inner contour are thus fixed as clamped, so that the outer and inner contour of the slat blank can not be influenced by the forming operation.

According to a preferred embodiment of the tool according to the invention the scraper ring is vertically supported on the inner wall of the embossing bell and on the outer wall of the Innenformprägers, so that the embossing surface of the scraper ring is guided in a defined position to the slat blank safely.

In a further embodiment of the tool according to the invention, the embossing bell on its inner wall on a profiling, which is adapted to the profile, in particular toothing of the outer contour of the fin blank. This allows a vertical guidance of the scraper ring and at the same time a radial securing of the outer contour against a rotation of the slat blank in the forming operation.
In a further development of the invention, the inner mold embosser is adapted on its outer wall to the inner contour of the slat blank, so that the slat blank is also secured against radial rotation.

In a further embodiment of the tool according to the invention, the stamping ammunition in the lower die part is annular and assigned to the scraper ring in the die upper part, wherein a filler for the power transmission and support is arranged in the interior of the stamping team.

Of essential importance for the invention is that the embossing shoulder is arranged on the inner wall of the embossing bell and the embossing shoulder of the Innenformprägers on the outer wall, the embossing shoulders have a position and shape, the size and shape of the Schnittgrates, the thickness of the lamella blanks and the corrugation profile of the embossing surfaces of the wiper ring and Prägeambos is tuned. This ensures that the waves can lead the ridge embossing on the ridge side of the lamella blank.

The lower die part further comprises a vertically guided in a Matrizeneinfassung, adapted to the embossing bell intermediate ring whose annular surface forms a seat for the embossing bell in the closed state of Gesenkoberteil and die lower part and the inner wall is adapted to the finely cut outer contour of the fin blank.
The slat blank is thus exactly in a defined position between the embossing surfaces of the scraper ring and Prägeambos, the outer and inner contour are fixed by the embossing bell and the inner mold embossing. To a certain extent, the scraper ring, embossing team, embossing bell and internal form embossing machine form the die in which the forming operations take place.

According to another embodiment of the tool according to the invention, the embossing bell is operatively connected via an upper pressure plate and the inner mold embosser via a further pressure plate with a fixed upper block of the upper part for performing all operations.
It is understood that the upper block can of course also be carried out liftable. In such a case, the lower block is formed correspondingly stationary.
The scraper ring, which at the same time performs a forming function in a further advantageous embodiment of the invention, is operatively connected via a pressure pin and an upper ring plate with an auxiliary hydraulic for stripping the finished formed lamella.

The Matrizeneinfassung, in which the intermediate ring and the Prägeambos are vertically guided over a lower pressure plate and operatively connected to a lower auxiliary hydraulics, fixed to the lower, fixed to the press ram block fixed so that the lower part of the tool a lifting movement for fixing, waves and embossing of the slat blank can perform.

In a further embodiment of the tool according to the invention, the embossing surfaces of the embossing and Abstreifrings coordinated with each different embossing profiles, such as a wave profile with uniformly shaped wave crests and troughs, or an irregular wave profile of at least two waves with differently shaped and spaced wave crests and wave troughs, so that slats with different corrugations can be produced.

The object is further achieved by a method that takes place within the corrugation and embossing stage at the same time with the waves of the lamella blank fixing the outer and inner contour to maintain their position and shape during the wave, the waves leading the ridge embossing and the outer and inner contour of the slat not their location, but can change their shape on the ridge side by the subsequent embossing.

It is particularly advantageous that the upper and lower sides of the slat blank are corrugated by an embossing boss belonging to the lower part of the die and a scraper ring belonging to the upper part of the die, thus perceiving both a forming function and a scraper function for the corrugated fin.

In a further embodiment of the method according to the invention can be used as embossing surfaces for anvil and scraper different embossed profiles, such as a wave profile with uniformly shaped wave crests and troughs, or an irregular wave profile of at least two waves with differently shaped and spaced wave crests and troughs used, so that the inventive Method can be variably adapted to different waveforms and fin dimensions.

Further advantages, features and details of Invention will become apparent from the following description with reference to the accompanying drawings.

embodiment

The invention will be explained in more detail below using the example of the production of a blade with external teeth. It is understood that by the invention as well slats are covered with an internal toothing.
Show it

Fig. 1a and 1b a perspective view and a side view of a commercially available corrugated outer fin,

Fig. 2 an exemplary arrangement of fineblanking stage and corrugation and embossing stage in a tool according to the invention in a perspective plan view,

Fig. 3 a schematic sectional view of the tool according to the invention in the closed state,

Fig. 4 an enlarged view of the slat blank between Prägeambos, scraper, embossing bell and Innenformpräger as a detail X the Fig. 3 .

Fig. 5 a perspective view of the upper die part of the tool according to the invention,

Fig. 6 a perspective view of the embossing bell of the tool according to the invention,

Fig. 7 a section along the line AA in the Fig. 6 .

Fig. 8 a perspective view of the scraper ring,

Fig. 9 a perspective view of the inner mold,

Fig. 10 a section along the line BB in the Fig. 9 .

Fig. 11 a perspective view of the Gesenkunterteils,

Fig. 12 a perspective view of the stamping team,

Fig. 13a to 13c Variants of wave profiles in representation of a development according to section along line CC in Fig. 11 and

Fig. 14a to 14d the sequence of the method according to the invention in a schematic representation.

The Fig. 1a and 1b shows a commercially available corrugated outer shell 1, which has an outer contour 2 with a Has toothing 3 and a circular inner contour 4, wherein the outer plate 1 is provided with a corrugation 5 (see Fig. 1b ).
The outer plate 1 has, for example, a thickness D of 1.8 mm and is made of steel.

The outer disk 1 is to be produced with a fine cutting tool 6, which comprises an upper part 7 and a lower part 8, which, like Fig. 2 and 3 show at least one fine cutting stage 9 and at least one corrugation and embossing stage 10 form.
The upper part 7 is fixed with its upper block 11 fixed to a machine table, not shown, and the lower part 8 with its lower block 12 hubbeweglich on a plunger of a press, so that the lamella blank 13 from bottom to top -that in the direction of top part of a Strip strip 14 is finely cut in the fine cutting stage 9, which corresponds to the known prior art and therefore need not be explained in more detail.
The burrs 15 on the slat blank 13 protrude at the Außenkontor 2 and the inner contour 3 of the slat blank 13 perpendicular to (see also Fig. 14c ).
The finely cut lamellar blank 13 is detected after ejection from the fine cutting stage 9 by a cross slide 16, transported with this in the corrugation and embossing stage 10 and stored there in precise position before the waves.

The Fig. 3 shows the basic structure of the embossing and wave stage 10 in the closed state. The embossing and wave stage 10 has a Gesenkoberteil 17 and Die lower part 18.
To Gesenkoberteil 17 include an annular embossing bell 19, an annular scraper ring 20 and an inner mold embossment 21. The embossing bell 19 is fixedly secured to an upper embossing plate 22, which in turn is fixed to the upper block 11.
The scraper ring 20 is supported on the inner wall 23 of the embossing bell 19 vertically and on the upper embossing pressure plate 22 horizontally, wherein the scraper ring 20 on its the embossing plate 22 side facing 24 via an actuatable by an upper auxiliary hydraulic 25 and a ring plate 26 pressure pin 27 is a vertical Can perform relative movement relative to the stamping bell 19. In the annular scraper ring 20 of the inner mold embossment 21 is inserted, which guides the scraper ring 20 vertically on its outer wall 28 and supported. On the inner mold embossment 21 is arranged in the annular scraper ring 20 separate pressure plate 29, which is operatively connected to the power transmission with the embossing pressure plate 22.
The die bottom 18 is formed by an annular die enclosure 30, an intermediate ring 31, an annular die 32 and a filler 33. The die skirt 30 is attached to the lower block 12. The intermediate ring 31, the Prägeambos 32 and the filling piece 33 rest on a lower embossing pressure plate 34, which in turn is connected via a lower auxiliary hydraulic 35 in operative connection.

As in Fig. 4 is shown enlarged form the embossing bell 19, the wiper ring 20 and the Inner shaped embossment 21 of the die upper part 17 with the intermediate ring 31, the embossing team 32 and the filling piece 33 of the die lower part 18 each active pairs with respect to the slat blank thirteenth
The lamellar blank 13 is enclosed on its outer contour 2 of the stamping bell 19 and on its inner contour 4 of Innenumformpräg 21, so that during the shaft of the lamellar blank 13 between the scraper ring 20 and 30 Prägeambos no distortion on the lamella blank 13 can be adjusted.

The Fig. 5 to 10 illustrate the structure of the Gesenkoberteils 17th
It can clearly be seen that the inner wall 23 of the embossing bell 19 and the outer wall 36a of the scraper ring 20 are matched to one another and together have a contour K which corresponds to the outer contour 2 of the slat blank 13.
In the annular scraper ring 20 of the inner mold embossment 21 is arranged vertically guided.
The Fig. 6 and 7 represent a perspective view of the embossing bell 19 and a section along the line AA of Fig. 6 The stamping bell 19 has on its formed by the lower seat surface 36 and the inner wall 23 centering edge 37 an embossing shoulder 38, the depth T on the size and shape of the towering ridge on the outer contour 2, the thickness D of the outer plate 1 and the height h the wave crest of the wave profiles is tuned.
In Fig. 8 the scraper ring 2 is shown, which faces a wave profile 39 on its embossing team 32 Embossed surface 40 has. This wave profile 39 is tuned to the desired curl of the outer plate 1.
The inner form embossment 21 has a cylindrical shape and is adapted in its contour to the inner contour 4 of the lamella blank 13 (see Fig. 9 ).
One recognizes Fig. 10 in that, at its lower centering edge 41 facing the upstanding ridge 15 on the inner contour 4, the inner form embossment 21 has an embossing shoulder 42 whose depth t corresponds to the dimension and shape of the ridge 15, the thickness D of the outer lamella 1 and the height h of the Wave profile is tuned.

The die lower part 18 is in Fig. 11 shown without matrix border. The inner wall 43 of the intermediate ring 31 and the outer wall 44 of the embossing team 32 have a coordinated contour K which corresponds to the outer contour 3 of the lamella blank 13.
The stamping team 32 has - like Fig. 12 shows on its embossing surface 45, a wave profile 46, which is adapted to the desired curl of the outer plate 1.
Examples of wave profiles 39 and 46 on the scraper ring 20 and Prägeambos 32 are as settlement in the Fig. 13a to 13c according to section line CC of Fig. 11 shown.
Thus, depending on the requirement, evenly or unevenly distributed corrugations such as 3-fold waves, 4-fold waves or 2 + 2-fold waves can be provided on the circumference of the slat blank 13.

The course of the method according to the invention is based on the Fig. 14a to 14d described. In Fig. 14a has the Cross slide 16 the slat blank 13 placed on the Prägeambos 32. Due to the centering edge 37 of the embossing bell 19, a centering on the outer contour 2 of the lamella blank 13 and the centering 41 centering on the inner contour 4, so that the lamella blank 13 is positioned exactly on the Prägeambos 19 for the clamping state (see Fig. 14b ).
The Fig. 14c shows the state in which the wave profile 39 of the embossing surface 40 of the scraper ring 20 with its crests 47 has reached the lamellar blank 13 by the lifting movement of the embossing team 32. The wave forming process on the lamellar blank sets in and is completed before the embossing shoulder 38 or 42 of the embossing bell 19 and the Innenformprägers 21 can grasp the cutting ridge 15 on the outer contour 2 and inner contour 4.
After further stroke of the embossing team 32 reach the embossing shoulders 38 and 42 the cutting ridge 15 and emboss this on the lamellar body. The embossing process is completed Fig. 14d has the wiper ring 20, the corrugated and ridge embossed outer plate 1 stripped by the upper auxiliary hydraulic 25 of the embossing shoulders 38 and 42. The outer disk 1 can be transported by opening the tool by means of the cross slide 16 on the tool.

LIST OF REFERENCE NUMBERS

outer plate

1

outer contour

2

gearing

3

inner contour

4

curl

5

Fine cutting tool

6

Top of 6

7

Lower part of 6

8th

Fine cutting stage

9

Well and embossing step

10

Upper block

11

Lower block

12

blade blank

13

tape strips

14

burrs

15

cross slide

16

Swaging part

17

Gesenkunterteil

18

embossing bell

19

scraper

20

Interior shape Präger

21

Upper embossing plate

22

Inside wall of 19

23

Seat side for 20

24

Upper auxiliary hydraulics

25

Upper ring plate

26

pushpin

27

Outer wall of 21

28

Separate pressure plate for 21

29

Matrizeneinfassung

30

intermediate ring

31

Ring-shaped embossing team

32

filling

33

Lower embossing plate

34

Lower auxiliary hydraulics

35

Lower seat of 19

36

outer wall

36a

Lower edge of 19

37

Embossed shoulder ah 19

38

Wave profile for 20

39

Embossing area of 20

40

Edge of 21

41

Embossing school of 21

42

Outer wall of 31

43

Outer wall of 32

44

Embossing area of 32

45

Wave profile of 32

46

crests

47

Thickness of the slat

D

stroke direction

H

Height of wave crest / wave profile

H

contour

K

Depth of the embossing shoulder 38

T

Depth of the embossing shoulder 42

t

Claims (16)

Tool for producing stamped parts, in particular slats, having an upper part (7) and a lower part (8), which at least one punching or fine cutting stage (9) for cutting the outer and inner contour (2.4) of a lamella blank (13) and forming at least one corrugation and embossing step (10) for corrugating the lamellar blank (13) and embossing the burrs (15) produced during cutting, the corrugating and embossing step (10) being in a die top part (17) and a die bottom part (18) is divided, characterized in that the upper die part (17) has a stamping bell (19), a scraper ring (20) provided with a stamping surface (40) with a corrugated profile (39) on the stamping surface (40) and an inner mold stamp (21) and the Die lower part (18) comprises an embossing team (32) with a wave profile (46) on its embossing surface (45), wherein the embossing bell (19) and the inner embossing (21) are each provided with an embossing shoulder (38, 42) facing the wave pro l (39) of the scraper ring (20) in the stroke direction (H) are arranged so that they can grasp the burrs (15) only after the waves, so that the waves leading the ridge embossing and the outer and inner contour (2,4) the lamella can not change its position, but can change its shape on the ridge side (48) after the waves. Tool according to claim 1, characterized in that the embossing bell (19) for fixing the outer contour (2) of the lamella blank (13) is annular and the outer contour (2) of the lamellar blank (13) completely encloses, and that the inner mold embossment (21) against the inner contour (4) is arranged supporting. Tool according to claim 1, characterized in that the scraper ring (20) on the inner wall (23) of the embossing bell (19) and on the outer wall (28) of the Innenformprägers (21) is supported and guided vertically. Tool according to claim 2, characterized in that the embossing bell (19) on its inner wall (23) has a profiling, which is adapted to the outer contour (2) of the lamellar blank (13). Tool according to claim 2, characterized in that the inner mold embossment (21) on its outer wall (28) to the inner contour (4) of the lamellar blank (13) is adjusted. Tool according to claim 1, characterized in that the embossing shoulder (38) on the inner wall (23) of the embossing bell (19) and the embossing shoulder (42) of the Innenformprägers (21) on its outer wall (28) is arranged, wherein the embossing shoulders (38 , 42) have a position and shape that is matched to the dimension and shape of the burr (15), the thickness (D) of the lamellar blank (13) and the wave profile (39) of the embossing surface (40) of the wiper ring (21). Tool according to claim 1, characterized in that the lower die part (18) in a Matrizeneinfassung (30) guided vertically, adapted to the embossing bell (19) intermediate ring (31) whose annular surface a seat for the embossing bell (19) in the closed state of the upper die part (17) and lower die part (19) and its inner wall is adapted to the finely cut outer contour (2) of the lamella blank (13). Tool according to claim 1, characterized in that the embossing bell (19) are operatively connected to an upper block (11) via an upper embossing pressure plate (22) and the inner form embossment (21) via a further pressure plate (29). Tool according to claim 2, characterized in that the inner mold embossment (21) in the scraper ring (20) is arranged vertically guided. Tool according to claim 9, characterized in that the scraper ring (20) via a pressure pin (27) and an upper annular plate (26) with an upper auxiliary hydraulic (25) is operatively connected to strip the finished slat. Tool according to claim 1, characterized in that the lower die part (17) further comprises a filling piece (33) which is guided vertically in the stamping boss (32) and which is assigned to the inner stamping element (21) in the die upper part (17). Tool according to claim 7, characterized in that the Matrizeneinfassung (30) is fixedly fixed to the lower block (12). Tool according to claim 7, characterized in that the intermediate ring (31) and the Prägeambos (32) via a lower pressure plate (29) and a lower block (12) with a lower auxiliary hydraulic (35) is operatively connected. Method for producing stamped parts, in particular fineblanked parts such as lamellas, with a tool according to claim 1, in which the outer and inner contour (2, 4) of a lamella blank (13) in a first method step consist of a strip of strip (14) within a blank and bottom part (7,8) comprehensive tool (6) in a punching or fine cutting stage (19) finely cut, the finely cut lamellar blank (13) by a cross slide (16) after opening the tool in a corrugation and embossing step (10) is spent in which the lamellar blank (13), after closing the tool in a second method step by forming on a die top part (17) and a die lower part (18) receives a wave profile (5) and embossing the burrs (15) formed during cutting on the lamella be carried out, wherein the first and the second method step are carried out in one stroke, characterized in that within the corrugation and embossing stage (10) coincident with the well fixing the outer and inner contour (2,4) to maintain their position and shape during the slat blank the corrugation takes place, with the corrugation leading the corrugations, and the outer and inner contours (2,4) of the fin not being able to change their position, but their shape at the ridge side (48) can be changed by the subsequent crimping. A method according to claim 14, characterized in that the lamellar blank (13) by a die lower part (18) belonging to Prägeambos (32) and a Gesenkoberteil (17) belonging scraper ring (20) is corrugated. A method according to claim 15, characterized in that wave profiles (39, 46) having uniformly shaped wave crests and troughs, or at least two irregularly shaped waves having different shaped wave crests and troughs are used.

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