EP0921876A1

EP0921876A1 - Method of producing and stacking components

Info

Publication number: EP0921876A1
Application number: EP97937585A
Authority: EP
Inventors: Johannes Haack
Original assignee: Feintool International Holding AG
Current assignee: Feintool International Holding AG
Priority date: 1996-08-28
Filing date: 1997-08-14
Publication date: 1999-06-16
Also published as: CA2263900A1; JP2000516858A; RU2167018C2; DE19634723A1; WO1998008634A1; DE19634723C2; US6182360B1

Abstract

The invention concerns a method of producing and stacking components (9) from individual layers (30) which are punched, cut or the like out of a material strip (5). According to the invention, after being punched out, the layers (30) are pressed back into the material strip (5) and pressed out of the latter in a subsequent station (II). They are then inserted into a stack magazine (31) in which the individual layers (30) are centred and assembled to form a component (9), the component then being removed from the stack magazine (31).

Description

Process for manufacturing and layering components

The invention relates to a method for producing and layering components from individual layers, which are punched out, cut out or the like from a strip of material and the layers are pressed back into the strip of material after punching out or the like, and a device therefor.

Components, for example for the automobile, such as connecting rods, cams, gear wheels, ring gears or the like are produced either by casting or from a relatively thick strip of material by punching out or cutting out. Such a fine blanking device is described, for example, in EP 0 183 648.

In the following, a known process chain for its production will be described using a full cam.

First, a blank is made from one by the punch press

Separated strips of material. On this blank is a Solid lubricant applied. The blank is then heated, preformed and annealed.

Now a solid lubricant is applied again, the semi-finished product is preformed and finally finished. Now calibration and induction hardening take place, after which broaching and chamfering to the finished cam is carried out. The cam is then placed on a tube so that a camshaft is created. This is ground. Such a method is very complex.

DE-OS 38 41 205 also describes the production of workpieces made of metal. Reference is made above all to the production of a connecting rod, the connecting rod being structurally broken down into individual simple partial profiles, which are produced by fine cutting and joined to form the finished part and connected to one another by layers. It is therefore a question of producing a structurally difficult part from different part profiles with different contours.

From DE 97 50 742 A1 it is known, for example, to cut sheet metal parts from sheet metal material by means of scissors and then to stack them on top of one another in a stacking device.

From Strasser F. "Tapping in very small sheet metal cutouts in: Werkstatt und Betrieb", 93 vol., 1960, issue 3, page 155, it is described that workpieces are perforated and cut out in subsequent cuts, but do not cut through after cutting the Schnittplatteö opening fall down, but are pressed back into the sheet metal strip by a spring-operated stop punch.

The object of the present invention is, however, simple components made of a plurality of identical layers - J - simple and inexpensive way to position each other.

The solution to this problem is that the layers ιr. a subsequent station can be printed out from the material strip and placed in a stacking magazine in which the individual layers are centered and connected to the component before the component is removed from the stacking magazine.

This means that components of greater thickness can be produced from individual, thin, hardened lamellae by layering. These layers are preferably connected to one another in a further processing method by riveting.

The individual slats have the shape of the part, the number of individual slats gives the cam height. Since the lamellae are very thin (e.g. 0.1 - 2 millimeters), the lamellae can be punched out of hardened material, so that subsequent hardening or grinding is no longer necessary. The layered component is a finished part. The material can already have a hardness of over 63 HRC.

The punching of the thin lamellae also makes it possible to produce cams with the smallest cross sections between the inner and outer contours. The cams can also have very small holes, e.g. B. 1 millimeter. These holes are used to lighten the weight, to balance the mass or can be used to hold a rivet.

By punching the thin slats, it is also possible to maintain class 6 tolerance qualities for internal and external shapes. Above all, the manufacturing costs are reduced, since the process sequence according to the invention manages with only a few work steps. Additional investments are hardly turnaround. De 'layered cam has enough already high demands irr motor, and is characterized By J ^r a honing damping ratio, low Gerauschb ldung and minimum wear, since a Kapillarwir arises ung through the slats and constantly lubricating oil is carried to the functional areas.

The heart of the device for carrying out the method is a punch press, in the tool of which the inner and outer shape of the layer are cut simultaneously in the overall cut. A follow-up tool would also be possible, but the tolerances between the inner and outer shape become too great.

The cut part is pressed back into the lead frame.

The internal mold waste falls through the cutting punch and corresponding chutes in the machine table of the punch press and is discharged downwards.

A joining station follows the punching tool, in which the individual layers are collected in a stacking magazine. Here, a package stamp prints the individual slats (layers) out of the lead frame in synchronism with the ram stroke of the punch press.

The whole is done according to the invention either in a cycle feed unit or on a rotary indexing table.

After a certain number of punching strokes, which corresponds to the number of layers for producing a component (cam), the rotary indexing table switches one position further or the stack magazine is transported to the next station in the cycle feed unit. At the same time, an empty stacking magazine gets under the packaging stamp. In the following station, at least one rivet is fed to the stacking machine, in a next station the layers are centered and riveted, in a next station, for example, the finished component is printed out of the stacking magazine by a stamp, is put on a tape or Like. And is transported for final assembly.

The strip of material preferably reaches the punch press from a self-propelled coil reel, a corresponding belt loop control being provided here. The punching machine itself is a precision punching machine with infeed feed, belt lubrication, etc. The method according to the invention, depending on the number of components required, is possible with a 1-way falling tool, but also with multiple falling tools, which results in an additional cost benefit.

Further advantages, features and details of αe: Invention result from the following description of preferred exemplary embodiments and from the drawing; this shows in

Figure 1 is a schematic representation of an inventive device for manufacturing and layering components.

Fig. 2 is a plan view of a schematically illustrated clock feed unit in the device according to FIG. 1;

3 shows a schematically illustrated process sequence for layered components;

4 shows an enlarged section of a punch press in the device according to FIG. 1 in the region of the tool;

5 is a plan view of a strip of material for forming the components,

6 shows a schematic illustration of a further exemplary embodiment of a device according to the invention for producing and layering components;

7 shows a perspective view of a cam produced by the method according to the invention;

8 shows cross sections through the cam along the line VIII-VIII in FIG. 7 with different rivets;

9 shows a perspective view of a further exemplary embodiment of a cam, produced by the method according to the invention;

10 shows a cross section through the cam according to FIG. 9 along the line XX. 1 has a device R for r and layers of components on a coil reel 2, a punch press 3, an only partially indicated clock feed unit 1 and a waste reel 4.

A strip of material 5 is rolled in a clockwise direction from a coil reel 2, which is provided with its own drive. This strip of material 5 passes through a light barrier 6 which indicates when the strip of material 5 sags too deeply. Then the material strip 5 runs into a material inlet 7 of the punch press 3 and there passes a lubricating device 8, via which lubricating oil reaches the surfaces of the material strip 5.

The material strip 5 next passes through a tool H for cutting out or punching the inner and outer shapes of component layers 30, in the present exemplary embodiment of cam layers.

A section of the tool H is shown enlarged in FIG. 4. It consists of an upper part 0 and a lower part U.

The upper part 0, which can be moved vertically, has a plunger 10, which can be seen better in FIG. 1. This plunger 10 is connected to a clamping plate 11 and to it a cutting plate 12, in which in turn an ejector 13 and two internal form stamps 14, 15 are guided. These inner form stamps 14, 15 serve to punch out inner forms from the cam layers 30. The ejector 13 is under the pressure of pressure bolts 16, 17.

A machine table 18 is assigned to the lower part U of the tool H. A platen 19 rests on this. A stripper plate 20 is under the pressure of pressure bolts 21, 22. In the clamping plate 19 and the stripper plate 20, a cutting punch 23 is provided. the conical shafts 24.1, 25.1. The αurcπ the inner form stamp 14, 15 from the cam layer 30 punched out inner form waste migrate down through chutes 24.2, 25.2 in the machine table 18 from the tool H. The parts are printed again immediately after punching in the lead frame. For this purpose, the forces act on the ejectors 13 and the stripper plate 20. A belt guide 26 corresponding to the material thickness serves to secure the advance of the lead frame with the parts pressed back to the next processing station.

FIG. 5 shows a plan view of the material strip 5 for forming the cam layers 30. The parts which are omitted as inner mold waste 27, 28 are indicated by hatching. Furthermore, the first stage of the clock feed unit 1 can be seen, in which a packetizing stamp 29 shown in FIG. 1 has pressed the punched cam layer 30 into a stack magazine 31. The stacking magazine 31 can be preceded by an intermediate magazine into which the package stamp 29 prints out individual parts.

A top view of the complete cycle feed unit 1 is shown in FIG. 2. It has a level A and a level B. The material strip 5 is transported to the plane A on the machine table 18. At this level A the individual process stages of layering and riveting take place, which are represented in FIG. 3 by stations II-V.

In station II, the punched cam layers 30 are printed from the material strip 5 into the stacking magazine 31 by means of the packaging stamp 29, and thus the cam 9, which consists of several such cam layers 30, is formed. In FIG. 3, the station II shows both the section and the top of the layered cam 9 in its stack magazine 31. After a predetermined number of times more than 30 ae. Forms cams 9, the cycle feed unit 1 pushes the stacking magazine 32 in the direction of the arrow to the next station III, while another stack magazine 31 m arrives at station II to form the next cam 9.

In station III, a rivet 33 A, B is fed in, while in station IV the individual cam layers 30, from which the cam 9 is made, are centered by means of a centering bolt 34 that exactly fills the inner shape in order to obtain an exact cam shape. If this is achieved, riveting takes place.

In station V, the stacked and riveted cam 9 is pressed out of the stacking magazine 31 by means of a stamp 35, placed on a conveyor belt 36 and transported for final assembly.

The empty stacking magazines 31 are now lined up, lowered to level B by means of the lowering unit 37, transported to the lifting unit 38 and raised to level A again by means of the lifting unit 38. There they are again available in front of station II for receiving cam layers 30. It is lowered to level B so that the stacking magazines 31 can pass under the feed 47.

The material strip 5, from which the individual cam layers 30 have been punched out, now runs through a feed 47 and is wound up by means of the waste reel 4 to form a waste coil.

A further exemplary embodiment of a device R ^ for producing and layering components is shown schematically in FIG. 6. This device R also has a coil reel 2 and a punch press 3, but to which a rotary indexing plate 39, an outfeed feed 42 and a pair of scissors 43 which cuts a scraping grid 44 from the lead frame.

On the rotary indexing table, which rotates about an axis, the punched cam layers 30 are pressed out of the material strip 5 into the stacking magazine 31 in station II by means of the packetizing stamp 29 and thus the cam 9, which consists of several of these cam layers 30, is formed.

Thereafter, further processing takes place in stations III-V, as described above, but on rotary indexing plate 39.

The material strip 5, from which the individual cam layers 30 have been punched out, reaches the outlet feed 42 via a deflection 41 and is cut off by means of the scissors 43, so that a waste grid 44 falls into a collecting container (not shown in more detail).

FIGS. 7 to 10 each show completely layered and riveted cams 9 and 9.1, respectively, produced by the method according to the invention. The number of cam layers 30 determines cam thicknesses 45.

Various rivets for connecting the cam layers 30 are shown in cross section in FIG. 8. 8a shows a hollow rivet 33. BI and FIG. 8b a solid rivet 33. B2. It is also possible to leave the rivet 33. AI hollow only in the rivet area, as is shown in FIG. 8b. As a fourth possibility, a rivet 33. A2 with collar is shown in FIG. 8d. DR. PETER WEISS

Patent attorney

European Patent Attorney y

Record number: 5181. 0 W / hu date: 1 1. 08. 1997

Item number list

1 cycle feed 34 centering pins 67 on.

1 coil reel 35 stamp 68

3 punch press 36 conveyor belt 69

4 waste reel 37 lowering unit 70 b material strips 38 lifting unit 71

6 light barrier 39 rotary indexing table 72

7 Material infeed 40 Infeed feed 73

8 Lubrication device 41 deflection 74

9 cams 42 outlet feed 75

10 plungers 43 scissors 76

11 clamping plate 44 waste grate 77

12 insert 45 cam width 78

13 ejector 46 axis 79

14 internal die 47 feed R device

15 48 H tool molds

16 pressure bolts 49 0 upper part

17 pressure bolts 50 U lower part

18 Machine table 51 A level

19 Platen 52 B level

20 wiper plate 53

21 pressure bolts 54

22 pressure bolts 55

23 cutting lights 56

24 bays 57

25 wells 58

26 tape guide 59

27 inner shape waste 60

28 inner shape waste 61

29 package stamp 62

30 cam layer 63

31 stacking magazine 64

32 stacking requirement 65 magazine 3A, rivet 66 B

Claims

PATENT CLAIMS

1. A method for producing and layering components (9) from individual layers (30), which are punched out of a material strip (5), cut out or the like. And the layers (30) after punching out or the like again in the material strip (5) pushed back,

characterized,

that the layers (30) are printed out of the material strip (5) in a subsequent station (II) and placed in a stack magazine (31) in which the individual layers (30) are centered and connected to the component (9), before the component is removed from the stack magazine (31).

2. The method according to claim 1, characterized in that the stack magazine (31) is transported in a cycle feed unit (1) from processing station to processing station.

3. The method according to claim 1, characterized in that the stack magazine (31) is transported on a rotary indexing table (39) from processing station to processing station.

4. The method according to any one of claims 1-3, characterized in that the material strip (5) from a coil reel (2) unwound and after punching out the layers (30) on a waste reel (4) is rewound.

5. The method according to any one of claims 1-3, characterized in that the material strip (5) according to the Punch out the layers (30; waste cutters i.44.

6. The method according to any one of claims 1-5, characterized in that the individual layers (30) by means of

Rivets (33 A, B) are connected to the component (9).

7. The method according to claim 6, characterized in that the riveting can take place both from below and from above.

8. The device for performing the method according to at least one of claims 1 to 7, characterized in that the punch press (3) is assigned a stack magazine (31) for receiving the individual layers (30).

9. The device according to claim 8, characterized in that the stack magazine (31) is arranged in a cycle feed unit (1).

10. The device according to claim 8, characterized in that the stack magazine (31) on a rotary indexing plate

(39) sits on.

11. The device according to any one of claims 8-10, characterized in that the stacking magazine (31) is assigned a packet stamp (29).

12. The apparatus according to claim 11, characterized in that an intermediate magazine is provided between the ejection punch (29) and the stacking magazine (31) for continuous work.

13. The apparatus of claim 11 or 12, characterized in that in a further station (III) at least one rivet (33 A, B) connects the layers (30) to the component (9).

14. Device according to one of claims 11 - 13, characterized in that in a further station (IV) a centering pin (34) is provided for centering the layers (30) before the final connection.

15. The apparatus of claim 13 or 14, characterized in that a stamp (35) for expressing the component (9) from the stack magazine (31) is provided in a further station (V).

16. The device according to at least one of claims 8 - 15, characterized in that the punching press (3) is preceded by a coil reel (2) and an inlet feed (7, 40).

17. The device according to at least one of claims 8 - 16, characterized in that the punch press (3) is followed by an outlet feed (42, 47).

18. The apparatus according to claim 17, characterized in that the outfeed feed (42, 47) is followed by scissors (43) or a waste reel (4).

19. The device according to at least one of claims 13 - 18, characterized in that the rivets (33 A, B) can be supplied both from above and from below.