EP3938196B1 - Punching press - Google Patents

Description

Technical area

The present invention relates to a punching press according to the preamble of claim 1.

State of the art

For the industrial production of stamped parts from sheet metal strips, fast-running automatic punching machines with crank or eccentric drives are used today, in which an upper tool part is moved towards a lower tool part and cuts and shapes are carried out on the sheet metal strip.

In order to keep the vibrations of the punching press as low as possible during operation and to enable good work results, the mass forces generated by the movements of the ram drive and the ram must be compensated as completely as possible within the press structure. For this purpose, modern punching presses have balancing weights, which are mounted within the housing structure of the press and are moved in opposite directions to the press ram and the components of the ram drive during operation, so that they compensate for the mass forces generated by them to a large extent within the press.

Out of CH 581 281 A5 A punching press is known in which the drive movement for the balancing weights for the vertical mass balancing is picked up on the pressure tabs of the ram drive, while the drive movement for the horizontal mass balancing is picked up on the connecting rod directly above the eccentric shaft.

Out of EP 0 395 964 B1 Another punching press is known in which the drive movement for the balancing weights for vertical mass balancing is picked up directly on the eccentric shaft by means of a separate passive connecting rod, while the drive movement for horizontal mass balancing below the eccentric shaft at the lower free end of the active connecting rod.

Out of GB 1 390 420 A A punching press with a top drive is known, in which the active connecting rods move counter to the punching direction and the horizontal drive movements required for horizontal mass balancing are picked up on the active connecting rods directly above the eccentric shaft. The drive movements required for vertical mass balancing are picked up at the end of the active connecting rods facing away from the eccentric shaft.

US 3,422,688 A discloses a punching press according to the preamble of claim 1.

Even if the press types described above are very successful products, they all have the disadvantage that any vibrations of the components used for mass balancing that arise during operation can be transferred to the press ram and can therefore negatively influence the cutting or embossing process.

Presentation of the invention

The task is therefore to provide a technical solution which does not have the previously mentioned disadvantage of the prior art or at least partially avoids it.

This task is solved by the punching press according to claim 1.

This relates to a punching press with a crank or eccentric drive, which has a crank or eccentric shaft and associated active connecting rods according to the claims for generating the lifting movement of the press ram. Furthermore, the punching press has balancing weights to balance the vertical and horizontal inertial forces that are generated during operation by the movements of the ram drive and the ram.

The punching press according to the invention is designed in such a way that it is used for horizontal mass balancing The required horizontal drive movements can be picked up directly on the crankshaft or eccentric shaft, namely on the side of the crankshaft or eccentric shaft. "Side on the crankshaft or eccentric shaft" means that the horizontal movements of a crank pin or an eccentric of the crankshaft or eccentric shaft directly in the area between two horizontal planes, which adjoin the crankshaft or eccentric shaft from below and from above, on the crank pin or Eccentric is picked up.

Furthermore, the punching press according to the invention is designed in such a way that the drive movements required for vertical mass balancing are picked up directly on the crankshaft or eccentric shaft, preferably above the crankshaft or eccentric shaft. "Above the crankshaft or eccentric shaft" means that the vertical movements of a crank pin or an eccentric of the crankshaft or eccentric shaft directly in the area between two vertical planes, which adjoin the crankshaft or eccentric shaft from both sides, above the crankshaft or eccentric shaft is picked up on the crank pin or eccentric.

The press according to the invention is also designed in such a way that each of the balancing weights serves to balance both horizontal and vertical mass forces.

The construction method according to the invention can prevent any vibrations that arise during operation of the components used for horizontal mass balancing from being transferred to the press ram and thereby negatively influencing the cutting or embossing process. A compact design with as few components as possible is also encouraged.

The punching press is preferably designed in such a way that the drive movements required for horizontal mass balancing are picked up via components on the crankshaft or eccentric shaft and applied to them Balancing weights are transferred, which are designed separately from the components that serve the ram drive. This makes it possible to achieve maximum decoupling of any vibrations that occur during operation of the components used for horizontal mass balancing from the press ram and thus from the cutting or embossing process.

Advantageously, all of the drive movements required for mass balancing, that is, both the drive movements required for horizontal and vertical mass balancing, are picked up via components on the crankshaft or eccentric shaft and transferred to the balancing weights, which are designed separately from the components , which serve the ram drive. This allows a maximum Achieve decoupling of any vibrations that occur during operation of the components used for mass balancing from the press ram and thus from the cutting or embossing process.

The drive movements required for the horizontal mass balancing are preferably picked up via auxiliary connecting rods acting on a crank pin or eccentric of the crankshaft or eccentric shaft, which can be designed completely independently or together with the active connecting rods or any connecting rods for picking up the drive movements for the vertical mass balancing ( demanding passive connecting rods).

It is advantageous that the auxiliary connecting rods extend from the crankshaft or eccentric shaft in a direction transverse to the intended direction of movement of the press ram, i.e. in a substantially horizontal direction pointing away from the crankshaft or eccentric shaft.

The ends of the auxiliary connecting rods facing away from the crankshaft or eccentric shaft are advantageously each coupled to one end of a pivotably mounted double lever, and are preferably articulated thereon. The second end of this double lever is coupled directly or via further coupling elements to a balancing weight for horizontal mass balancing, and is advantageously articulated to it.

It is further preferred that the ends of the auxiliary connecting rods facing away from the crankshaft or eccentric shaft are each coupled via a tab to the end of the respective pivotally mounted double lever.

The second end of this double lever is preferably coupled via a tab to the respective balancing weight for horizontal mass balancing.

These previously mentioned configurations have proven to be particularly suitable for tapping and the transmission of the drive movements required for horizontal mass balancing.

In a particularly preferred embodiment of the punching presses, in which the drive movements required for horizontal mass balancing are picked up via claimed auxiliary connecting rods acting on a crank pin or eccentric of the crank or eccentric shaft, these auxiliary connecting rods are designed separately from the claimed active connecting rods, which are used to generate the lifting movement of the Press ram serve.

This makes it possible to achieve maximum decoupling of any vibrations that occur during operation of the components used for horizontal mass balancing from the press ram and thus from the cutting or embossing process.

In another preferred embodiment, these auxiliary connecting rods are each designed together with the active connecting rods, which serve to generate the lifting movement of the press ram. This can expediently be done by forming an active connecting rod and an auxiliary connecting rod in one piece, for example in such a way that the eye of the active connecting rod on the crank or eccentric shaft side also forms the eye of the auxiliary connecting rod on the crank or eccentric shaft side, and that an auxiliary eye is formed on the side of this eye , which forms the eye of the auxiliary connecting rod facing away from the crankshaft or eccentric shaft. This makes it possible to achieve good decoupling of any vibrations that occur during operation of the components used for horizontal mass balancing from the press ram and thus from the cutting or embossing process, and at the same time realize a compact design with few separate components.

In yet another preferred embodiment, the punching press according to the invention is designed in such a way that the drive movements required for vertical mass balancing are applied via acting on a crank pin or eccentric of the crank or eccentric shaft Claimed passive connecting rods are picked up, which can be designed completely independently or together with the active connecting rods or any connecting rods for picking up the drive movements for horizontal mass balancing (claimed auxiliary connecting rods).

It is advantageous that the passive connecting rods extend from the crankshaft or eccentric shaft in a substantially vertical direction pointing away from the press ram.

The ends of the passive connecting rods facing away from the crankshaft or eccentric shaft are advantageously each articulated to one end of a pivotally mounted double lever, the second end of which is articulated directly or via further coupling elements to a balancing weight for vertical mass balancing.

It is further preferred that the respective balancing weight for vertical mass balancing is carried by the respective end of the respective double lever.

These previously mentioned configurations have proven to be particularly suitable for picking up and transmitting the drive movements required for vertical mass balancing.

In a further preferred embodiment of the punching presses, in which the drive movements required for horizontal mass balancing are picked up via claimed auxiliary connecting rods acting on a crank pin or eccentric of the crank or eccentric shaft, and the drive movements required for vertical mass balancing are picked up via on a crank pin or eccentric of the crank shaft. Passive connecting rods acting on the claimed passive connecting rods or eccentric shaft are picked up, these auxiliary connecting rods are each designed together with the passive connecting rods. This can expediently be done by forming a passive connecting rod and an auxiliary connecting rod in one piece, for example in such a way that that the crank or eccentric shaft-side eye of the passive connecting rod also forms the crank or eccentric shaft-side eye of the auxiliary connecting rod, and that an auxiliary eye is formed on the side of this eye, which forms the eye of the auxiliary connecting rod facing away from the crank or eccentric shaft. This makes it possible, particularly when the active connecting rods are designed separately, to achieve very good decoupling of any vibrations that arise during operation of the components used for mass balancing from the press ram and thus from the cutting and/or stamping process, and at the same time realize a compact design with few separate components.

In another preferred embodiment, the auxiliary connecting rods and the passive connecting rods are formed by separate components. This makes it possible to achieve maximum decoupling of any vibrations that arise during operation of the components used for horizontal mass balancing and the components used for vertical mass balancing.

It is advantageous in the embodiment of the punching press according to the invention in which the drive movements required for horizontal mass balancing are picked up via auxiliary connecting rods acting on a crank pin or eccentric of the crank or eccentric shaft and the drive movements required for vertical mass balancing are picked up via a crank pin or eccentric of the Claimed passive connecting rods acting on the crankshaft or eccentric shaft are picked up, at least some of the auxiliary connecting rods, passive connecting rods and active connecting rods are mounted on a common crank pin of the crankshaft or on a common eccentric of the eccentric shaft. This promotes a compact design.

The balancing weights for horizontal mass balancing are advantageously on both sides of the crankshaft or eccentric shaft in the punching press according to the invention arranged. This concept has proven to be particularly suitable.

In yet another preferred embodiment, the punching press according to the invention is designed in such a way that the active connecting rods extend from the crankshaft or eccentric shaft in the direction of the press ram, the ends of the active connecting rods facing away from the crankshaft or eccentric shaft each being at one end of a one-sided lever are articulated. The other end of the respective one-sided lever is mounted in an articulated manner on the housing of the punching press directly or via additional coupling elements. A pressure tab, which is connected to the press ram, is articulated on the one-sided levers in an area between their two ends.

These previously mentioned configurations have proven to be particularly suitable for generating the lifting movement of the press ram.

Brief description of the drawings

• Fig. 1 einen Vertikalschnitt durch eine erfindungsgemässe Stanzpresse;
• Fig. 2 einen Schnitt entlang der Linie X-X in Fig. 1;
• Fig. 3 einen Schnitt entlang der Linie Y-Y in Fig. 1;
• Fig. 4 eine Darstellung wie Fig. 2 einer erfindungsgemässen Variante der Stanzpresse.

Further preferred embodiments of the invention result from the dependent claims and from the following description based on the figures. Show:

• Fig. 1 a vertical section through a punching press according to the invention;
• Fig. 2 a cut along the line XX in Fig. 1 ;
• Fig. 3 a cut along the line YY in Fig. 1 ;
• Fig. 4 a representation like Fig. 2 a variant of the punching press according to the invention.

Ways of carrying out the invention

Fig. 1 shows a vertical section through a punching press according to the invention, in which, in normal operation, the press ram 13, which is driven by an eccentric drive arranged in the upper part of the press structure 11, works from above against the clamping plate 14 of the press.

As if in conjunction with Fig. 2 can be seen, which is a horizontal section through the press along the line XX in Fig. 1 shows, the plunger 13 is driven via an eccentric shaft 1a, which has an eccentric bushing 1b for the purpose of adjusting the eccentricity.

Arranged on the eccentric bushing 1b are two pairs of active connecting rods 9a, 9b, which extend from the eccentric shaft 1a, 1b in the direction of the press ram 13. The ends of the active connecting rods 9a, 9b facing away from the eccentric shaft 1a, 1b are each articulated in pairs at one end of a substantially horizontally extending one-sided lever 10a, 10b, the other end of which is articulated on the housing 11 of the punching press.

A pressure tab 12a, 12b is articulated on the one-sided levers 10a, 10b in the area between the two ends, which is connected to the press ram 13 and moves it up and down during normal operation.

In order to keep the vibrations of the punching press as low as possible during operation and to enable a good work result, the press has two balancing weights 2a, 2b arranged on both sides of the eccentric shaft 1a, 1b, which are mounted within the housing structure 11 of the press and rotate in opposite directions to the press ram during operation 13 and to the components of the plunger drive 9a, 9b; 10a, 10b; 12a, 12b are moved so that they compensate for the vertical and horizontal mass forces generated by them to a large extent within the press.

As if in conjunction with Fig. 3 can be seen, which has an essentially horizontal cut along the line YY in Fig. 1 shows, the drive of the balancing weights 2a, 2b is designed such that the drive movements required for the horizontal and vertical mass balancing are picked up directly on the eccentric shaft 1a, 1b.

The drive movements required for horizontal mass balancing are picked up on both sides laterally on the eccentric shaft 1a, 1b via auxiliary connecting rods 5a, 5b arranged on the eccentric bushing 1b, which, starting from the eccentric shaft 1a, 1b, extend in a direction transverse to the intended direction of movement S of the press ram 13 extend.

The drive movements required for vertical mass balancing are picked up above the crank or eccentric shaft 1a, 1b via passive connecting rods 3a, 3b arranged on the eccentric bushing 1b, which extend from the eccentric shaft 1a, 1b in a direction pointing away from the press ram 13.

Like from the Figures 2 and 3 As can be seen, the auxiliary connecting rods 5a, 5b and the passive connecting rods 3a, 3b are formed by common components, that is to say a passive connecting rod 3a or 3b and an auxiliary connecting rod 5a or 5b are combined to form a common one-piece component. This is implemented in such a way that the eccentric shaft-side eye 16a, 16b of the respective passive connecting rod 3a, 3b also simultaneously forms the eccentric shaft-side eye of the associated auxiliary connecting rod 5a, 5b, and that an auxiliary eye 15a, 15b is formed on the side of this eye 16a, 16b, which the eye of the respective auxiliary connecting rod 5a, 5b facing away from the eccentric shaft. The active connecting rods 9a, 9b are designed separately from the auxiliary connecting rods 5a, 5b and the passive connecting rods 3a, 3b.

The ends of the auxiliary connecting rods 5a, 5b facing away from the eccentric shaft 1a, 1b, which are formed by the auxiliary eyes 15a, 15b, are each coupled via a tab 8a, 8b to one end of a pivotably mounted double lever 6a, 6b, the second end of which via another Tab 7a, 7b is coupled to the lower end of one of the balancing weights 2a, 2b. The arrangement of the tabs and levers 7a, 8a, 6a, or 7b, 8b, 6b is selected such that a horizontal movement of the auxiliary eye 15a, 15b of the respective auxiliary connecting rod 5a, 5b causes an opposite horizontal movement of the respectively assigned balance weight 2a or 2b causes.

The punching press is therefore designed in such a way that the drive movements required for horizontal mass balancing are carried out via components 5a, 5b; 6a, 6b; 7a, 7b; 8a, 8b are picked up on the eccentric shaft 1a, 1b and transferred to the balancing weights 2a, 2b, which are designed separately from the components 9a, 9b; 10a, 10b; 12a, 12b, which serve the plunger drive.

The ends of the passive connecting rods 3a, 3b facing away from the eccentric shaft 1a, 1b, which are each formed by an eye 17a, 17b, are each articulated at one end of a pivotally mounted double lever 4a, 4b, the second, fork-shaped end of which is at the upper end of one of the Balancing weights 2a, 2b are articulated and carry them. The arrangement is chosen such that a vertical movement of the eye 17a, 17b of the respective passive connecting rod 3a, 3b causes an opposite vertical movement of the respectively assigned balance weight 2a or 2b.

The punching press is also designed in such a way that the drive movements required for vertical mass balancing are carried out via components 3a, 3b; 4a, 4b are picked up on the eccentric shaft 1a, 1b and transferred to the balancing weights 2a, 2b, which are formed separately from the components 9a, 9b; 10a, 10b; 12a, 12b, which serve the plunger drive.

Fig. 4 shows a section along line XX in Fig. 1 in a variant of the punching press according to the invention. This variant differs from the variant according to Figures 2 and 3 in that the auxiliary connecting rods 5c, 5d and the passive connecting rods 3a, 3b are formed by separate components.

Here the auxiliary connecting rods 5c, 5d and the active connecting rods 9a, 9b are formed by common components, i.e. an active connecting rod 9a or 9b and an auxiliary connecting rod 5c or 5d are combined to form a common, one-piece component. This is implemented in such a way that the eccentric shaft-side eye 16 of the respective passive connecting rod 9a, 9b also forms the eccentric shaft-side eye of the associated auxiliary connecting rod 5c, 5d, and that an auxiliary eye 15c, 15d is formed on the side of this eye 16, which is that of the eccentric shaft 1a, 1b forms the eye of the respective auxiliary connecting rod 5c, 5d. The active connecting rods 9a, 9b and also the auxiliary connecting rods 5c, 5d are each designed here as pairs of connecting rods. The passive connecting rods 3a, 3b are designed separately from the active connecting rods 9a, 9b.

While preferred embodiments of the invention are described in the present application, it should be clearly understood that the invention is not limited thereto and may be embodied in other ways within the scope of the following claims.

Claims (19)

1. Punch press with a crank or eccentric drive, comprising a crankshaft or eccentric shaft (1a, 1b) and active connecting rods (9a, 9b) for generating the stroke movement of the press ram (13), and with balancing weights (2a, 2b) for balancing the vertical and horizontal mass forces,

   wherein the punch press is adapted in such a way that the horizontal drive movements required for the horizontal mass balancing are tapped directly at the crankshaft or eccentric shaft (1a, 1b),

   wherein the punch press is adapted in such a way that each of the balancing weights (2a, 2b) serves for balancing horizontal mass forces as well as for balancing vertical mass forces,

   characterized in that the punch press is adapted in such a way that the drive movements required for the vertical mass balancing are tapped directly at the crankshaft or eccentric shaft (1a, 1b), in particular above the crankshaft or eccentric shaft (1a, 1b).
2. Punch press according to one of the preceding claims, wherein the punch press is adapted in such a way that the drive movements required for the horizontal mass balancing are tapped via components (5a, 5b; 6a, 6b; 7a, 7b; 8a, 8b) on the crankshaft or eccentric shaft (1a, 1b) and are transmitted to the balancing weights (2a, 2b), which are formed separately from components (9a, 9b; 10a, 10b; 12a, 12b) serving to drive the ram.
3. Punch press according to one of the preceding claims, wherein the punch press is adapted in such a way that all the drive movements required for mass balancing are tapped via components (3a, 3b, 4a, 4b, 5a, 5b; 6a, 6b; 7a, 7b; 8a, 8b) at the crankshaft or eccentric shaft (1a, 1b) and are transmitted to the balancing weights (2a, 2b), which are formed separately from components (9a, 9b; 10a, 10b; 12a, 12b) serving to drive the ram.
4. Punch press according to one of the preceding claims, wherein the punch press is adapted in such a way that the drive movements required for the horizontal mass balancing are tapped via auxiliary connecting rods (5a, 5b, 5c, 5d) engaging on the crankshaft or eccentric shaft.
5. Punch press according to claim 4, wherein the punch press is adapted in such a way that the auxiliary connecting rods (5a, 5b, 5c, 5d) extend from the crankshaft or eccentric shaft (1a, 1b) in a direction transverse to the intended direction of movement (S) of the press ram (13).
6. Punch press according to claim 5, wherein the ends of the auxiliary connecting rods (5a, 5b, 5c, 5d) facing away from the crankshaft or eccentric shaft (1a, 1b) are each coupled, in particular articulated, to one end of a pivotably mounted double lever (6a, 6b), the second end of which is coupled, in particular articulated, directly or via further coupling members (7a, 7b) to a balancing weight (2a, 2b) for horizontal mass balancing.
7. Punch press according to claim 6, wherein the ends of the auxiliary connecting rods (5a, 5b, 5c, 5d) facing away from the crankshaft or eccentric shaft (1a, 1b) are each coupled via a link (8a, 8b) to the end of the respective pivotably mounted double lever (6a, 6b) .
8. Punch press according to one of the claims 6 to 7, wherein the second end of the respective pivotably mounted double lever (6a, 6b) is coupled in each case via a link (7a, 7b) to the respective balancing weight (2a, 2b) for the horizontal mass balancing.
9. Punch press according to one of the claims 4 to 8, wherein the auxiliary connecting rods (5a, 5b) and the active connecting rods (9a, 9b) are formed by separate components.
10. Punch press according to one of the claims 4 to 8, wherein the auxiliary connecting rods (5c, 5d) and the active connecting rods (9a, 9b) are formed by common components.
11. Punch press according to one of the preceding claims, wherein the punch press is adapted in such a way that the drive movements required for the vertical mass balancing are tapped via passive connecting rods (3a, 3b) engaging on the crankshaft or eccentric shaft (1a, 1b).
12. Punch press according to claim 11,
    wherein the punch press is adapted in such a way that the passive connecting rods (3a, 3b) extend from the crankshaft or eccentric shaft (1a, 1b) in a direction pointing away from the press ram (13).
13. Punch press according to claim 12,
    wherein the ends of the passive connecting rods (3a, 3b) facing away from the crankshaft or eccentric shaft (1a, 1b) are each articulated to one end of a pivotably mounted double lever (4a, 4b), the second end of which is articulated directly or via further coupling members to a balancing weight (2a, 2b) for vertical mass balancing.
14. Punch press according to claim 13,
    wherein the respective balancing weight (2a, 2b) for the vertical mass balancing is supported by the respective end of the respective double lever (4a, 4b).
15. Punch press according to one of the claims 4 to 9 and according to one of the claims 11 to 14, wherein the auxiliary connecting rods (5a, 5b) and the passive connecting rods (3a, 3b) are formed by common components.
16. Punch press according to one of the claims 4 to 10 and according to one of the claims 11 to 14, wherein the auxiliary connecting rods (5c, 5d) and the passive connecting rods (3a, 3b) are formed by separate components.
17. Punch press according to one of the claims 4 to 10 and according to one of the claims 11 to 16, wherein the auxiliary connecting rods (5a, 5b, 5c, 5d), the passive connecting rods (3a, 3b) and/or the active connecting rods (9a, 9b) are mounted on a common crank pin of the crankshaft or on a common eccentric of the eccentric shaft (1a, 1b).
18. Punch press according to one of the preceding claims, wherein the balancing weights (2a, 2b) are arranged on both sides of the crankshaft or eccentric shaft (1a, 1b) for the horizontal mass balancing.
19. Punch press according to one of the preceding claims, wherein the punch press is adapted in such a way that the active connecting rods (9a, 9b) extend from the crankshaft or eccentric shaft (1a, 1b) in the direction of the press ram (13), wherein the ends of the active connecting rods (9a, 9b) facing away from the crankshaft or eccentric shaft (1a, 1b) are each articulated to one end of a single-sided lever (10a, 10b), the other end of which is mounted in an articulated manner on the housing (11) of the punch press, either directly or via further coupling members, and wherein a thrust shackle (12a, 12b), which is connected to the press ram (13), is articulated to each of the single-sided levers (10a, 10b) in a region between their two ends.

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