EP0927630B1 - Press, in particular punch press - Google Patents

Abstract

The press has a frame (2) in which is located a drive shaft (1) on which at least one connecting rod unit (8) is eccentrically located. The connecting rod unit is connected to a pressure column via a rocker member (27,28) to which a one-armed lever (33,34) is articulatedly connected. The rocker member is point-symmetrically formed and is located in the press frame at its symmetry point.

Description

The present invention relates to a Press with at least one pressure column and articulated on it Tappet for connection to at least one Tool for shaping a band-shaped, gradually advanced workpiece, which press a press frame and one stored in the same Has drive shaft on which drive shaft at least one connecting rod unit is mounted eccentrically.

Such presses are known in the professional world Stamping presses referred to and the present invention concerns in particular a so-called high-speed Punch press. Such presses are becoming bigger today Nominal force and large tool space. The Ram are driven by a drive shaft of the press about an arrangement of power transmission elements driven, which in turn must be very stable, one should have high spring stiffness and accordingly high Have masses.

That means that in operation one high-speed punch press with extremely large masses extremely high stroke rates are moved, making very high Inertial forces as well as high acceleration and Delay forces occur.

In the operation of a high-speed punch press arise from the ram and the power transmission elements not only very high inertial forces and moments of inertia, but also very high unbalance forces and Imbalance moments that need to be compensated. To the Compensate the unbalance forces and unbalance moments Balance weight devices, i.e. balance masses needed, which in turn additional inertia and Generate moments of inertia and in their bearings and Bearings of their drive members generate frictional forces.

Such stamping presses continue to be high Requirements for the accuracy and quality of using them manufactured products.

Many punch presses have become known the good constructive solutions to some of the described Include problems, but designs lead that are beneficial for a given problem area often at a disadvantage in another problem area.

For example, the punch press has the CH-A-543 376 a large distance between the pressure columns, which is beneficial to the ram tipping stiffness affects. Next are the driving force of the Drive shaft on the components transmitting the ram formed such that the in the vertical direction oscillating masses are largely balanced. However, counterweight units are still available complete balancing of the vertical oscillating masses necessary, with the result that additional inertia and bearing friction arise. In particular, the training of the machine parts, which drives the drive force from the drive shaft to the Tappets transmit such that long power transmission paths prevail, with which a larger one Machine suspension is generated, which is disadvantageous affect the punching process. The components that are used Serve height adjustment and at the deflection point of the Forces, i.e. Bearing of the two-armed lever of the mentioned punch press are arranged with the double punching force.

The CH-A-574 323 shows a punch press, at which is the machine parts which are the driving force of the drive shaft on the plunger do not transmit long Form power transmission paths. Through the distribution of forces The one-armed levers reduce them to the Drive connecting rod and on the components for adjusting the ram height acting forces. However, the pressure columns have a little mutual distance on what's going on adversely affects the ram tipping stiffness. in the further large balancing masses are required correspondingly high inertial forces, moments of inertia and Cause bearing friction.

The invention seeks to remedy this. The object of the invention is a punch press, in particular to create high-speed punch press, the small one Power transmission paths between the drive shaft and the Tappet, and thus a small machine suspension has, but a large mutual distance allowed between the pressure columns and thus tilting the plunger is advantageously counteracted, the one long tool installation space without excessive climbing the masses of the components for the transmission of the driving force allowed on the pestle, and that no additional, vertically acting balancing masses are required.

The punching machine according to the invention, as it is is characterized in claim 1, has an eccentric mounted connecting rod unit, each with a rocker link and a one-armed lever attached to it a respective pressure column is connected.

The advantages achieved by the invention can be seen in particular in that the components for Transmission of the driving force from the drive shaft to the plunger is rigid and hardly resilient and Small even in the case of long tool installation spaces Form moving masses. As a result, they are only small Masses of counterweights necessary. Continue kicking in Operation of the punch press only small dynamic mass inertial forces and moments and a minimum of bearing friction on.

The subject of the invention is as follows on the basis of drawings showing execution routes for example explained in more detail.

Fig. 1 einen Längsschnitt durch eine Stanzpresse,

Fig. 2 einen Ausschnitt aus Fig. 1, in einem grösseren Massstab gezeichnet,

Fig. 3 einen Schnitt entlang der Linie I-I der Fig. 1, in einem grösseren Massstab gezeichnet,

Fig. 4 einen Schnitt entlang der Linie II-II der Fig. 1, in einem grösseren Massstab gezeichnet,

Fig. 5 einen Schnitt gleich dem Schnitt nach Fig. 3 einer weiteren Ausführung des Erfindungsgegenstandes und

Fig. 6 einen Schnitt gleich dem Schnitt nach Fig. 4 der Ausführung des Erfindungsgegenstandes nach Fig. 5.

It shows:

1 shows a longitudinal section through a punch press,

2 shows a detail from FIG. 1, drawn on a larger scale,

3 shows a section along the line II of FIG. 1, drawn on a larger scale,

4 shows a section along the line II-II of FIG. 1, drawn on a larger scale,

Fig. 5 is a section similar to the section of FIG. 3 of another embodiment of the subject of the invention and

6 shows a section similar to the section according to FIG. 4 of the embodiment of the subject matter of FIG. 5.

The drive shaft 1 of the punch press is in the Machine frame 2 stored, the top through a cover plate 3 is complete. The drive of the drive shaft 1 is done by one (not shown) engine and one Belt drive, of which a pulley 4 is drawn is. The driving force is from the pulley 4 via a brake / clutch device 5 on the drive shaft 1 transferred. Such brake / clutch devices are well known and for a detailed Description is, for example, on CH-A-546 141 pointed out.

In the figures, the is for clarification Brake disc 6 of the brake / clutch device drawn.

The drive shaft 1 has an eccentric Section 7 on which a connecting rod unit is mounted which is generally designated by reference number 8.

3 and 4 the connecting rod unit 8 has two connecting rod members 9, 10. 5 and 6, the further will be described below, the connecting rod unit 8 four connecting rods 11, 12, 13, 14.

The connecting rods 9, 10 are at their lower ends of a common connecting rod pin 15 enforced. The connecting rod 15 is at both ends with a sliding block 16, 17 in connection. The sliding block 16 is guided in the guide 18, and the sliding block 17th is guided in the guide 19.

On the connecting rod 15 there are four tabs 20, 21, 22, 23 articulated. The tabs 20, 21 form a first Pair of tabs, in which the upper ends of the tabs 20, 21 protrude into the connecting rod 10. The tabs 22, 23 form a second pair of tabs, in which the upper Protrude ends of the tabs 20, 23 into the connecting rod 9.

The tab 20 of the first pair of tabs 20, 21 is at its lower end on a first pivot link 24 hinged. The tab 21 of the first pair of tabs 20, 21 is articulated on a second pivot member 25. The tab 22 of the second pair of tabs 22, 23 is also articulated on the second pivot pin member 25. The Tab 23 of the second pair of tabs 22, 23 is on one third pivot member 26 articulated.

The first pivot link 24 and the third Swivel pin member 26 are in a first two-armed Lever 27 used, which is thus over the tabs 20 and 23rd to accommodate the arrow height with the connecting rods 9 and 10 is articulated.

The second pivot member 25 is in one second two-armed lever 28 is used, which thus over the tabs 21 and 22 for receiving the arrow height also articulated with the connecting rods 9 and 10 is.

In the embodiment shown, they are as Rocker members working two-armed levers 27, 28 point symmetrical. You point at the drawn version lever arms with the same length on. However, there are also versions with different lengths Lever arms provided. These two-armed levers 27, 28 are stored in the machine frame 2 via bolts 29, 30 (Fig. 2 and Fig. 4).

With her of the tabs 20, 21, 22, 23 distant end are the two-armed levers 27, 28 over Pivots 31, 32 on one-armed levers 33, 34 articulated. At the other end are the one-armed levers 33, 34 via pivot pins 35, 36 and tabs 37, 38 the spindle nuts 39, 40 of the ram height adjustment devices 41, 42 articulated, of which the spindles 43, 44, the straight guide pin 45, 46 in the machine frame 2 are guided and the drive gear wheels 47, 48 for rotating the spindles 43, 44 are drawn. In the Fig. 4 are for the one-armed lever in addition to the Reference numbers 33, 34 and reference numbers 33 ', 34' registered. The reason for this is that each of these levers for constructional reasons two single ones side by side arranged arms, namely 33, 33 'and 34, 34'.

A detailed description of this Ram height adjustment devices can be found in US-A-5 052 257 be removed.

On each one-armed lever 33, 34 is over a pivot pin 49, 50 a pressure column 51, 52 articulated which pressure columns 51, 52 by movable Seals 53, 54 pass through and over bolts 55, 56 are articulated on the plunger 57.

It should be noted that with the drawn Execution of the distance between the pressure columns 51, 52 supporting pivot pin 49, 50 and the pivot pin 35, 36 in the ram height adjustment devices 41, 42 is greater than the distance between the pressure columns 51, 52 supporting pivot pin 49, 50 and the pivot pin 31, 32 for the two-armed levers 27, 28. This relative distances are not mandatory. It can at other versions different spacing ratios to be available.

Guide pillars 58, 59 protrude from the plunger 57 down that in the tape running level 60 in column guides 61, 62 are guided. The strip running level is in punch presses 60 defined as the level that is defined by the Gradually advanced metal strip to be machined is determined. Under the ram 57 is the with the tool platen connected to the machine frame 2 63.

The connecting rod members 9, 10 of the connecting rod unit 1 have extensions 64, 65 at the top. On these extensions 64, 65 cross rods 66, 67 are articulated by the Extensions 64, 65 from in opposite directions point. The reference numerals 68, 69 denote the pivot pins. The cross bars 66, 67 are in their of the Extensions distal ends with pivot pins 70, 71 with eccentrically mounted counterweight parts 72, 73 connected. The bearings of these counterweight parts 72, 73 are with the reference numerals 74, 75 indicated.

These balance weight parts 72, 73 serve to the horizontal components of the rotating Compensate the unbalanced mass of the punch press.

The dimensions, lengths of the lever arms and Masses of all components for driving the plunger 57 and the plunger 57 itself are dimensioned such that none resulting unbalance occurs in the vertical direction, i.e. it is not an additional leveling compound Compensate for any vertical Imbalance components necessary.

Looking at the way of power transmission from the connecting rod unit 8 to the plunger 57 and the training the corresponding components of the punch press, can be notice the following.

The pressure columns 51, 52 have a very large distance from each other. Hence they are at the most possible points on the ram 57, so that with an eccentric punching load of the Ram 57 ensures resistance to tipping is.

The power transmission path from the connecting rod unit 8 to ram 57 is extremely short. So that is under punching load a minimal suspension of the Components participating in the power transmission ensured which are correspondingly very rigid components. Continue the components are designed such that they are overall have a small mass. This means that the acceleration and deceleration forces are small and moreover can the bearing loads and thus the bearing friction low being held. Consequently, the drive power can be low being held. The camp games are also smaller and it can produce products with higher precision getting produced.

The connecting rod unit 8 shown in FIG. 1 obviously moves in the vertical direction between a top position (top dead center position) and a bottom position (bottom dead center position) and goes through a middle position, from the top and the lowest position has the same distance. In the geometric axes determine this central position the articulation points of the components for the transmission of the Driving force a geometric straight line. That is, see 2 that the longitudinal central axes of the bolts, or Pins 24, 30, 32, 50, 36 on the one hand and 24, 29, 31, 49, 35 on the other hand, lie on a common straight line. This has the advantage that the rashes of Levers 28, 34 and 27, 33 on the operation of the punch press are limited to a minimum.

The execution of the The punch press according to the invention is shown in FIGS. 3 and 4 in particular a single-shaft, two-point punch press, i.e. a punch press with two pressure columns 51, 52.

However, the invention is also, for example applicable to a single-shaft four-point punch press, which execution below with reference to the 5 and 6 will be described.

For the sake of clarity, these are Description the same reference numerals as far as possible used for the previous description has been.

The stamping press shown has one Drive shaft 1, which is mounted in the machine frame 2 is, the cover plate with the reference number 3 is designated.

The drive is from a not shown Motor via a belt drive, of which the Pulley 4 can be seen. The reference number 5 denotes the clutch / brake device from which the brake disc 6 is visible.

The on the eccentric section 7 of the The connecting rod unit 8 mounted on the drive shaft 1 has four connecting rod elements 11, 12, 13, 14 arranged side by side on. The connecting rods 11, 12, 13, 14 are with one common connecting rod bolt 15 connected.

The connecting rod bolt protrudes at its outer ends 15 in a sliding block 16, 17, and in his middle area is another sliding block 76 arranged. The sliding blocks 16, 17 are in guides 18, 19 out and the further sliding block 76 is in the Leadership 77 led.

On the connecting rod 15 there are eight tabs 78, 79, 80, 81, 82, 83, 84, 85 stored.

The four tabs 78, 79, 80, 81 that over the Connecting rod bolts 15 on the two connecting rod members 11, 12 are articulated, form a first bracket group, and the four tabs 82, 83, 84, 85 that over the connecting rod bolt 15 are articulated on the two connecting rod members 13, 15, form a second tab group.

The inner two, right next to each other arranged tabs 79, 80 of the first tab group 78, 79, 80, 81 are via a common pivot link 86 hinged to a first two-armed lever 87.

The outer two tabs 78, 81 of the first Tab group 78, 79 80, 81 are each one separate pivot pin member 88, or 89 on a second two-armed lever 90 articulated.

The inner two, right next to each other arranged tabs 83, 84 of the second tab group 82, 83, 84, 85 are via another common pivot link 91 on a third two-armed lever 92 articulated.

The outer two tabs 82, 85 of the second Tab group 82, 83, 84, 85 are each one another separate pivot pin member 93 or 94 on one fourth two-armed lever 95 articulated.

The first two-armed lever 87 and the one next to it third two-armed lever 92 arranged on it are on one common bolt 30 stored.

In the same way, the second are two-armed Lever 90 and the fourth lever 95 arranged next to it mounted on a common bolt 29.

The first two-armed lever 87 is over one Swivel pin 96 on a first single-armed lever 97 articulated to which a first pressure column 98 is articulated is. The second two-armed lever 90 is over one Swivel pin 99 on a second one-armed lever 100 on which a second pressure column 101 is articulated. The third two-armed lever 92 is over a pivot pin 102 on a third one-armed lever 103 articulated on which a third pressure column 104 is articulated. The fourth two-armed lever 95 is over a pivot pin 105 on a fourth one-armed lever 106 articulated on which a fourth pressure column 107 is articulated.

The four pressure columns 98, 101, 104, 107 are articulated together on the plunger 57, so that a Four-point suspension of the plunger 57 is present.

The remaining units of this second Execution, e.g. Mass balance weights with their Drive, ram height adjustment, ram guide, etc. are the same as those of the first embodiment, so that there is another description of the same superfluous. The only thing to note is that the second Execution of different units in comparison with the first version are duplicated. The longitudinal section the second version is similar to the longitudinal section the first embodiment of FIG. 1st

Claims (11)

1. Press with at least one pressing column (51, 52; 98, 101, 104, 107) and a ram (57) pivotally mounted thereto to be connected to at least one tool for a shape producing working of a strip-shaped workpiece which is advanced step by step, which press includes a press frame (2) and a drive shaft (1) which is supported in same, on which drive shaft (1) at least one connecting rod unit (8) is supported eccentrically, characterized in that the connecting rod unit (8) is connected to a respective pressing column directly via a rocking member (27, 28; 87, 90, 92, 95) and thereafter via a single arm lever (33, 34, 97, 100, 103, 106) pivotally mounted to the rocking member (27, 28; 87, 90, 92, 95).
2. Press according to claim 1, characterized in that the rocking member (27, 28; 87, 90, 92, 95) is of a point symmetrical design and is supported at its point of symmetry in the press frame (2).
3. Press according to claim 1 or 2, characterized in that the rocking member (27, 28; 87, 90, 92, 95) is designed as a double arm lever.
4. Press according to one of the preceding claims, characterized in that the double arm lever (27, 28; 87, 90, 92, 95) which forms the rocking member is supported in the press frame (2) for rotation about a stationary axis (29, 30), is pivotally mounted at one end to the connecting rod unit (8), and at the opposite end directly to the single arm lever (33, 34; 97, 100, 103, 106), which single arm lever (33, 34; 97, 100, 103, 106) is pivotally mounted at its end remote from the double arm lever (27, 28; 87, 90, 92, 95) to a device (41, 42) for adjusting the height position of the ram mounted to the press frame (2).
5. Press according to one of the preceding claims, characterized in that the dimensions, masses and lengths of the lever arms of the structural members which move when the press is in operation are selected such, that when the press is in operation the vertical component of the moving masses is zero, so that no structures for a vertical balancing of masses are needed.
6. Press according to one of the preceding claims, characterized in that the double arm levers (27, 28; 87, 90, 92, 95), in order to compensate for the height of arrow, are pivotally mounted to the connecting rod unit (8) via link members (20, 21, 22, 23; 78 - 85), and that in one operational position of the press the pivot axes and axes of rotation, respectively of the points where the single arm levers (33, 34; 97, 100, 103, 106) are connected to the devices (41, 42) for the adjusting of the height position of the ram, of the points where the pressing columns (51, 52; 98, 101, 104, 107) are pivotally mounted to the single arm levers (33, 34; 97, 100, 103, 106), of the points where the single arm levers (33, 34; 97, 100, 103, 106) are pivotally mounted to the double arm levers (27, 28; 87, 90, 92, 95), of the points where the double arm levers (27, 28; 87, 90, 92, 95) are pivotally supported, and of the points where the double arm levers (27, 28; 87, 90, 92, 95) are pivotally mounted to the link members (20-23; 79-85) connecting them to the connecting rod unit (8), are located on a straight line common to all.
7. Press according to one of the preceding claims, characterized in that the connecting rod unit (8) includes projecting extensions (64, 65) which are located relative to the drive shaft (1) opposite of the point where the connecting rod unit (8) is pivotally mounted to the link members (20-23; 78-85) via which the connecting rod unit (8) is connected to the double arm levers (27, 28; 87, 90, 92, 95), further wherein lateral bars (60, 67) extend from the projecting extensions (64, 65) in opposite directions and are pivotally mounted at their ends remote from the projecting extensions (64, 65) each to an eccentrically supported mass balancing weight body (72, 73), which mass balancing weight bodies (72, 73) are adapted to balance the horizontal components of the rotating unbalanced mass of the punch-press.
8. Press according to one of the preceding claims, characterized in that the connecting rod unit (8) comprises at least two connecting rod members (9, 10; 11-14) which connecting rod members (9, 10; 11-14) are connected via link members (20-23; 78-85) for the absorbing of the heights of arrow to at least two double arm levers (27, 28; 87, 90, 92, 95) which extend in opposite directions away from each other and in which a connecting rod pin (15) is received at the end remote from the drive shaft (1), which is connected to slider members (16, 17; 76) for a rectilinear guiding of the connecting rod members (9, 10; 11-14), on which connecting rod pin (15) the link members (20, 21; 22, 23; 78, 79; 80, 81; 82, 83; 84, 85) are arranged in pairs in such a manner that the link members (20, 21; 22, 23; 78, 79; 80, 81; 82, 83; 84, 85) of each pair project at their first end into a respective connecting rod member (9, 10; 11-14).
9. Press according to claim 8, characterized in that the one link member (20, 23; 78, 81; 82, 85) of each pair of link members is pivotally mounted to one of the double arm levers (27; 90, 95) via a pivot pin member (24, 26; 88, 89; 93, 94) and the other link member (21, 22; 79, 80; 83, 84) is pivotally mounted via a further pivot pin member (25; 88, 91) to a further double arm lever (28; 87, 92) extending in the opposite direction of the first named double arm lever.
10. Press according to claim 9, characterized in that the connecting rod unit (8) comprises two connecting rod members (9, 10) arranged side by side and accordingly a group of four link members (20-23) arranged side by side, of which the inner two link members (21, 22) which are located directly side by side are pivotally mounted via a pivot pin member (25) common to both to one of the double arm levers (28), and the outer two link members (20, 23) which are located remote from each others are pivotally mounted by a respective separate pivot pin member (24, 26) to the further double arm lever (27) which projects in the opposite direction of the first named one.
11. Press according to claim 9, characterized in that the connecting rod unit comprises four connecting rod members (11-14) located side by side and accordingly eight link members (78-85) located side by side which are divided in two groups (78-81; 82-85) of four link members located side by side, that the inner two link members (79, 80) of the one group (78-81) located directly side by side are pivotally mounted via a pivot pin member (86) common to both to a first double arm lever (87) and the outer two link members (78, 81) of this one group (78-81) located remote from each other are pivotally mounted each via a respective separate pivot pin member (88, 89) to a second double arm lever (90) extending in an opposite direction relative to the first one, that the inner two link members (83, 84) of the other link member group (82-85) which are located directly side by side are pivotally mounted via a further common pivot pin member (91) to a third double arm lever (92) which extends in the same direction as the first double arm lever (87) that the outer two link members (82, 85) of the other link member group (82-85) which are located remote from each other are pivotally mounted each via a respective pivot pin member (93, 94) to a fourth lever (95) extending in an opposite direction relative to the third one, which four double arm levers (87, 90, 92, 95) are pivotally mounted each to a single arm lever (97, 100, 103, 106) which is mounted to a pressing column ((98, 101, 104, 107) so that the ram (57) of the press is suspended on four pressing columns (98, 101, 104, 107).

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