EP0765735B1 - Toggle link punch press - Google Patents

Abstract

The drive arrangement (5,6) incorporates knuckle joint units (15a,b-18a,b) with two on each side of the drive mechanism. The knuckle joint units are connected to at least one plunger (56,57), and each has a first and second guide rod linked by hinge pin (24-27) to the pressure column (28-31). The pressure column on the press housing (23) is movable in the lifting direction of the plunger and is immovable in a direction crosswise to the lifting direction of the plunger. The stamping compartment contains a surface (60) along which the strip runs.

Description

The invention relates to a punch press a press housing, at least one ram, one Punching room in which a strip running level of a respective to be fed through the punching space in the tape feed direction, band to be processed is determined with a drive device with an arrangement of Toggle lever units connected in the tape feed direction arranged on both sides of the drive device are.

The development goes with modern punching technology towards complete processing of a raw material, i.e. a complete chipless production of an article. That means that a punch press trained to a complete manufacturing center becomes. In addition to the usual cutting and forming (bending) operations are also increasingly used in stamping presses Assembly and joining work carried out, it is welded, riveted and threads are also formed. After each processing step, one to be processed The same is done in the punch press by one given route. Further are increased also measuring devices for quality assurance during ongoing Process used. That means the length of the Tool installation space, i.e. the punching space, becomes longer the more individual work steps in the punch press be performed. As a result, tool installation spaces are becoming longer and longer required.

To now have a longer tool installation space would only have to have a conventional press design be enlarged to scale. In order to however, the permissible nominal load increases, based on the Scale in the square, and the masses with the third power.

However, in practice for longer tool spaces rarely at the same time higher nominal loads are required. The extreme growth of the masses, especially the moving masses is even undesirable.

So there is a scale-up a punch press to achieve a longer tool installation space an excessively high machine price, low Machine speeds, a large amount of energy and poorly manageable dynamic mass forces, in particular in the case of manufacture and processing finer and high-precision parts.

GB-A-288 398 shows a press whose Tappet from a drive with toggle lever units an upper and a lower handlebar each moved becomes. The lower handlebars are directly on the tappet articulated, which is therefore not guided in the strip running plane is and especially with an eccentric Cannot tilt the load. Because the Pestle only by the directly on it articulated lower handlebar, there is a highly imprecise guidance that is unacceptable for punch presses of the pestle.

DE-B-1 127 175 has toggle lever units on whose upper handlebars on the machine frame and their lower links are hinged to bridges. These bridges are with tension columns in the machine frame connected, which in turn rigidly connected to the plunger are. So there is also no deflection of the ram possible with an off-center load and moreover would cause bending forces in the Traction columns for increased friction and wear lead the same and their guides.

The invention seeks to remedy this. The object of the invention is to provide a punching machine in which the power transmission with an arrangement of Toggle lever units are made, which has a long tool installation space has, but allows high machine speeds, no increased energy consumption required and none causes excessively high dynamic mass forces.

The punching machine according to the invention, as it is is characterized in claim 1, contains at least one side of their drive device at least two Toggle units. All toggle lever units of the punch press are connected to the drive with at least one plunger.

The advantages achieved by the invention are particularly seen in the fact that an extremely long Tool installation space is made possible, but high machine speeds, a limited power requirement and deep dynamic mass forces prevail.

Further goals and advantages result from the dependent claims.

The subject matter of the invention is explained below of drawings illustrating execution paths, for example explained in more detail.

Figur 1 einen Schnitt durch eine Stanzpresse,

Figur 2 einen Schnitt entlang der Linie II-II der Figur 1,

Figur 3 in vergrössertem Massstab einen Ausschnitt aus der Figur 1,

Figur 4 einen Schnitt entlang der Linie IV-IV der Figur 3, und

Figur 5 einen Schnitt entlang der Linie V-V der Figur 1.

It shows:

FIG. 1 shows a section through a punch press,

FIG. 2 shows a section along the line II-II in FIG. 1,

FIG. 3 shows an enlarged section of FIG. 1,

4 shows a section along the line IV-IV of Figure 3, and

5 shows a section along the line VV of Figure 1.

In the description below, as Embodiment described a punch press that an electric motor via a clutch brake device is driven, which is connected to an eccentric shaft is. However, there are also designs that for example a crankshaft, hydraulic drives, Have drives containing cams, etc.

The punch press of the drawn version has an eccentric shaft 1. This eccentric shaft 1 is from a drive motor 51 via a belt drive 52 and a clutch brake device 2 driven. Such Clutch brake devices for punch presses are common known, so that there is a detailed description superfluous. In Figure 5 are of the clutch brake device 2, the brake disc 41 and the Friction linings 49, 50 are shown.

The eccentric shaft 1 has eccentric sections 3, 4a and 4b. On the eccentric section 3 is a Connecting rods 6 mounted, and on the eccentric sections 4a, 4b a forked connecting rod 5 is mounted. For the eccentric sections 3, 4a and 4b can also be rotated relative to one another Bushes for adjusting the stroke of the punch of the punch press be present, as is the case with various known ones Punch presses is the case.

The connecting rod 5 is connected to a pivot pin 7 a connecting link 9a, 9b articulated, and the connecting rod 6 is via a hinge pin 8 on a connecting bracket 10a, 10b articulated.

The connecting strap 9a, 9b is over one first pin 11 articulated to first toggle lever core 15a, 15b. The connecting strap 9a, 9b is also over a second bolt 12 on second toggle lever core 16a, 16b hinged. The connecting strap 10a, 10b is over a third bolt 13 is articulated to the toggle lever core 17a, 17b. Finally, the connecting tab 10a, 10b continue via a fourth bolt 14 on knee lever core 18a, 18b articulated.

The respective upper toggle links 15a, 16a, 17a and 18a are via eccentric shafts 19, 20, 21 and 22 supported in the housing 23 of the punch press.

The respective lower toggle links 15b, 16b, 17b and 18b are on via bolts 24, 25, 26 and 27 respectively Pressure columns 28, 29, 30 and 31 articulated. The bolts 24, 25, 26 and 27 are with their end portions, in the figure 2, for example, the end sections 25a, 25b are drawn, stored in sliding blocks, the general in Figure 1 with the reference numbers 32, 33, 34 and 35 and in the Figure 3 generally identified by reference numerals 32, 33 are. In the sectional view of Figure 2 are the shown two sliding blocks of a bolt, so the sliding blocks 33, 33a at the two ends of the bolt 25. The sliding blocks 32, 33, 34, and 35 are over grooves supported on the housing 23. These grooves are in the 3 generally identified by reference numerals 36 and 53, and accordingly in the sectional view of FIG 2 with 36a and 36b.

Coming back to the upper knee lever core 15a, 16a, 17a and 18a has been stated above that they supported by eccentric shafts 19, 20, 21 and 22 in the housing 23 are. These eccentric shafts 19, 20, 21 and 22 are connected to worm gears 37, 38, 39 and 40. The Worm gears 37, 38, 39 and 40 mesh with worms 45, 46, 47 and 48. In the embodiment shown are Screws 45 and 46 via a drive shaft 43 with a Servo motor 42, and the screws 47 and 48 via a drive shaft 44 connected to a servo motor 41.

The with the lower knee lever core 51b and 16b connected pressure columns 28 and 29 are via bolts 54 and 55 connected to a plunger 56, and the pressure columns 30 and 31 are connected with a plunger 57.

Alternatively, all four pressure columns 28, 29, 30 and 31 also connected with a single plunger or each of the pressure columns could be with one own tappet.

Below is the arrangement of the ram guides described, with particular reference to the figures 3 and 4 is referred.

The plunger 56 is fixed with two downwards projecting guide columns 58, 59 connected. The pillars 58, 59 are in guides in the tape running plane 60 61, 62 out. The plunger 57 is fixed with guide columns 63, 64 connected and guided in guides 65, 66. This guide arrangement is in CH-A-568 848 or US-A-3 998 498 is described in detail and is incorporated herein by reference Reference to these documents for the sake of disclosure.

The plungers 56, 57 additionally contain one further, i.e. third guide 67 or 68, which above the Belt running level 60 is arranged. With the press housing 23 firmly connected further guide columns 69, 70 protrude into these third guides 67 and 68, respectively. The guides 67, 68 have sliding surfaces 71 (FIG. 4), (see those given above Documents) which are in the longitudinal direction of the punch press, i.e. run in the tape feed direction. The guides 67, 68 thus prevent the rams from deflecting 56, 57 in the transverse direction of the punch press, but leave due the sliding surfaces 71 a thermal expansion of the plunger 56, 57 to, without any tappet guides of the Tappet 56, 57 to brace.

In the figures, the platen is Punching press with the reference number 72 and its base plate identified by reference numeral 73.

With respect to the longitudinal direction of the Eccentric punch press or tape feed direction Punching load F (Fig. 3) between e.g. the pestle 56 and the platen 72 or base plate 73 are the Pressure columns 28, 29 deformed differently elastically. The plunger 56 assumes an inclined position, as in FIG Fig. 3 with the route S is indicated, the (exaggerated drawn) inclination of the plunger 56 by the dashed line T is shown. The elastic Deformation and change in position of the pressure column 29 are by the dashed line U and corresponding at the pressure column 28 by the dashed line V shown. Next is the inclination of the guide column 58 represented by the dashed line W.

The fact that the guides 61, 62 on the Belt running level 60 are arranged, the tipping point K remains of the ram 56 on the belt running level 60. That is, that the plunger 56 or the tool connected to it 74 (upper tool) does not deflect in the belt running plane 60.

The guide 67 or its running surfaces 71 (FIG. 4) allow a corresponding shift. The seals 75, 76 between the press housing 23 and the Pressure columns 28, 29 are movable seals, which prevent even when the ram 56 is inclined, that oil from the closed press housing 23 in the Work space emerges and the band to be processed as well the tools are dirty.

It was now the behavior of the various Components when the ram is eccentrically loaded 56 described. Exactly the same behavior of the corresponding Components appear when the load is off-center of the ram 57.

The plunger 56 is above the pressure columns 28, 29 and the knee joint levers 15a, 15b and 16a, 16b with the eccentric shafts 19 and 20 connected as above described, with a common drive, the servo motor 42 are connected.

The pestle stands accordingly 57 via the pressure columns 30, 31 and the knee joint levers 17a, 17b and 18a, 18b with the eccentric shafts 21 and 20 in connection, which in turn with the servo motor 41 in Connect. It can thus be seen that the high altitudes of the two plungers 56 and 57 independently of one another are adjustable. Obviously, the servomotors can also be operated synchronously, so that the high altitudes the plunger 56 and 57 also adjustable synchronously are.

Claims (7)

1. Punch press with a punch press frame (23), at least one ram (56; 57), a punching space in which a web running plane (60) of a respective web to be processed and be fed through the punching space is set, with a driving mechanism (5, 6) which is coupled to a arrangement of toggle joint units (15a, 15b; 16a, 16b; 17a, 17b; 18a, 18b) which are arranged at both sides of the driving mechanism (5, 6) in relation to the direction of feed of the web, whereby at least two toggle joint units (15a, 15b; 16a, 16b; and 17a, 17b; 18a, 18b, resp.) are located at least at one side of the driving mechanism (5, 6), and all toggle joint units (15a, 15b; 16a, 16b; 17a, 17b; 18a, 18b) a drivingly connected to at least one ram (56, 57) and each toggle joint unit (15a, 16b; 16a, 16b; 17a, 17b; 18a, 18b) includes a first (15a, 16a, 17a, 18a) and a second lever (15b, 16b, 17b, 18b) pivotally mounted to same, which second lever (15b, 16b, 17b, 18b) is pivotally mounted to the pressing column (28, 29, 30, 31) by means of a pivot pin (24, 25, 26, 27), which pivot pin (24, 25, 26, 27) is guided at the press frame (23) to be movable in the direction of the stroke of the ram (56, 57) and to be unmovable in a direction laterally relative to the direction of the stroke of the ram (56, 57).
2. Punch press according to claim 1, characterized in that two toggle joint units (15a, 15b; 16a, 16b; 17a, 17b; 18a, 18b) are located at either side of the driving mechanism (5, 6), which are respectively pivotally mounted to one pressing column (28, 29, 30, 31), such that the punch press comprises four pressing columns (28, 29, 30, 31).
3. Punch press according to one of the preceding claims, characterized in that two toggle joint units (15a, 15b; 16a, 16b; 17a, 17b; 18a, 18b) are located at both sides of the driving mechanism (5, 6) each which are pivotally mounted via their respective pressure column (28, 29, 30, 31) to one ram (56, 57) so that the punch press includes separate two rams (56, 57) located at a distance from each other seen in the direction of feed of a web.
4. Punch press according to one of the preceding claims, characterized in that the eccentric shafts (19, 20) of the toggle joint units (15a, 15b; 16a, 16b) located at one side of the driving mechanism (5, 6) are coupled to a first drive (42, 43) and the eccentric shafts (21, 22) of the toggle joint units (17a, 17b; 18a, 18b) located at the other side of the driving mechanism (5, 6) are coupled to a second drive (41, 44), so that the eccentric shafts (19, 20; 21, 22) and accordingly the rams (56, 57) may be synchronously or separately adjusted regarding their position of height.
5. Punch press according to one of the preceding claims, characterized in that each ram (56, 57) includes at one end area two guiding columns (58, 59; 63, 64) located at a distance from each other, which are mounted to the press frame (23) and are guided at the web running plane (60).
6. Punch press according to one of the preceding claims, characterized in that there is arranged at the area of each ram (56, 57) one further guiding column (69, 70) located at a distance from the two guiding columns (58, 59; 63, 64), which is rigidly mounted to the press frame (23), which projects into a further guiding unit (67, 68), which is located in the ram (56, 57) above the plane (60) of feed of a web, so that each ram (56, 57) is guided at three locations.
7. Punch press according to one of the preceding claims, characterized in that the driving mechanism (5, 6) includes two connecting rods (5, 6) projecting from a driving unit (1, 2) in opposite directions and driven by same in opposite senses, which are drivingly connected to the toggle joint units (15a, 15b; 16a, 16b; 17a, 17b; 18a, 18b) by respective connecting levers (9a, 9b; 10a, 10b).

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