DE2845924C2 - High-speed punching press - Google Patents

Description

a) the press ram (4) is at the top with a cylinder (14) guided in the upper yoke (8) connected, whose piston (16) is held stationary with its piston rod end on the upper yoke (8) of the press frame (1), wherein the piston rod (17) pressure medium bores (28) for the cylinder spaces above and below the Includes piston (16);

b) the cylinder (14) has an annular piston collar (18) on its outside, which is of a stationary damping cylinder (19) filled with hydraulic fluid is surrounded, the one opposite the annular piston collar (18) irr. Diameter larger central space (20) with downwardly connected damping chamber (21) for the working stroke of the press ram and upwardly connected damping chamber (22) for the return stroke the inside diameter is equal to the outer diameter of the annular piston collar (18);

c) the two damping chambers (21, 22) into which the annular piston collar (18) is immersed are over adjustable throttle bores (23) connected to the central space (20).

2. High-speed punching press according to claim I, characterized in that the pressure medium for the Cylinder spaces above and below the piston (16) is compressed air.

3. High-speed punching press according to claim 1, characterized in that the annular piston collar (18) on the one hand has an annular piston surface (30) which extends orthogonally to the press ram (4) and which dips into the damping chamber (21) for the working stroke, and on the other hand with an inclined annular piston surface ( 31) is provided, which dips into the damping chamber (22) for the return stroke.

4. high-speed punching press according to claim 1, characterized by adjusting screws (32) which can be immersed with tips (33) in the throttle bores (23).

The invention relates to a high-speed punching press for processing sheet metal, sheet metal parts and the like with a fixed press table and Werksloffaufnahmc in the press frame as well as up and down movable press stencil with Prel.Hverk / eug and electrodynamic drive, the concentric / around press ram arranged on the obcriocli of the Prvssengestolis has supported, single or multi-layer Flachspuleiiring and a driver plate assigned to the press ram, with end position damping and resetting of the press ram.

In generic high-speed stamping presses (DE-OS 19 55 400), the electrodynamic drive is a Associated with a capacitor that is discharged and allows an electric current to flow through the coil of the flat current ring. The work is done by electrodynamic repulsion between the flat coil lenring and the driver board. The course of the Discharge current in the coil is mainly due to the capacitance of the capacitor, the inductance of the coil as well as by the ohmic resistance of the flat coil ring and the line determined by the time The variable current flowing in the flat coil ring is in the driver plate, which is in the starting position is arranged close to the flat coil ring, a secondary current is induced and accelerated as a result the driver plate together with the press stem pel and the pressing tool away from the flat coil ring. The machine functions as an electrical / mechanical converter. In a relatively long way, electrical energy is converted into kinetic energy by means of electromagnetic field force, which then is implemented in a very short way in cutting work, forming work or compression work. The ratio of the distances covered behaves like the inverse ratio of the forces generated. in the Result will be with very high accelerations worked. This also applies to the return movement, when overall short cycle times are sought. Consequently, high-speed punching presses of the generic type on the one hand, devices for end position damping, on the other hand, devices for resetting the Press ram required. They are designed as springs in the known presses of the generic type. Daa is disadvantageous because it can cause vibration phenomena. When it comes to presses of other types, experience is familiar

■ »ο Reset devices in the form of hydraulic or pneumatic cylinder piston arrangements. Screw presses or hydraulic presses with hydraulic end position damping are also known. However , both the resetting devices and the devices for the end position damping are always independent components that are not integrated with the press ram and are not combined with one another. The arrangement of such devices in a generic high-speed punching press would

This is how high-speed punching presses are structured, functionally and in terms of control technology Complicate aspects considerably.

In contrast, the invention is based on the object of a high-speed punching press of the generic type a resetting device free of mechanical spring arrangements with integrated end position damping to realize.

This object is achieved with a high-speed punching press of the type described above, which

feo is characterized by the combination of the following features:

a) the press temperature! is: after .'L ^ n with a>'\ hrider ve carried out in Oberioch; nimden. whose piston with its K (i! v-nsMiigoii-r, <u · um OK: yoke des Pi cssiiigcsiLM lld'm, ·,!: izenaiu'ii. where (iie piston rod I ^; ν: ■■ "<! ,.,:; eii, 'o, "iri.jii: e ;! i \ ^r die /.ylinderr.'Kii.ii.· übe;, Jini ii; i; e: eiern Ki.iruv-

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contains;

b) the cylinder has an annular piston collar on its outside, which is supported by a stationary one a hydraulic fluid filled D. vaccination cylinder is surrounded, the one opposite the Ring piston collar with a larger diameter central space with a downwardly connected damping chamber for the working stroke of the press ram and upwardly connected damping chamber for the return stroke with clear diameter equal to the outer diameter of the annular piston collar;

c) the two damping chambers into which the annular piston collar is immersed are adjustable Throttle bores connected to the central space.

Individual design features of the claimed high-speed punching press in this or other · form customary. To solve the problem it is only a matter of the commonality of the claimed features at.

According to a preferred embodiment of the invention, the pressure medium for the cylinder spaces is above and below the piston compressed air.

On the one hand for the working stroke, on the other hand for the Reset stroke different damping work must be done, the invention further recommends that the annular piston collar has, on the one hand, an annular piston surface that runs orthogonally to the press ram, which dips into the damping chamber for the working stroke, and on the other hand with a sloping one The annular piston surface is provided into which the damping chamber for the return stroke is immersed. The choke effect can be achieved in the simplest case with adjusting screws with tips in throttle bores are immersible.

The following are the features described, the functional relationships and the achieved Advantages explained in more detail with reference to a drawing showing only one embodiment. It shows

Fig. 1 is a schematic representation of a vertical section by a high-speed press according to the invention,

FIG. 2 shows the enlarged section A from the object according to FIG. 1.

The basic structure of the high-speed press shown in the figures consists of the press frame 1 with fixed press table 2 and workpiece holder 3 and the up and movable press ram 4 with the press tool 5 and an electrodynamic drive. The electrodynamic drive has a concentric z \ in the press frame 1 in the press frame 1 arranged, single-layer or multi-layer flat bobbin ring 6. The press stamp! 4 has an assigned, also ring-shaped driver plate 7. The flat coil ring 6 is on the upper yoke 8 of the press frame 1 supported, namely in the embodiment via attached anchor packages 9, which are U-shaped and designed mounted on the Flaehsniilenring 6 like a rider and in c'tie f.nisspracheiide Kammer 10 am Oberjoch 8 des '-v ^ engestelK 1 are used. Is indicated in I ι {. '. i also those on the electrodynamic drive associated capacitor bank 11 with resonant circuit 12. With the discharge of the capacitor bank 11 electrodynamic forces are never generated, the

⁴⁰

over the driver plate 7 the press ram 4 in In the direction of the FIG. 1 drawn workpiece 13, on which in the exemplary embodiment a punching work is to be carried out

The upper part of the press ram 4 is a cylinder 14 of a resetting cylinder piston arrangement 15 The piston 16 is stationary with its piston rod 17 in the upper yoke 8 of the press frame 1 held. The cylinder 14 also has an annular piston collar 18 on its outside surrounded by a damping cylinder 19 held stationary on the upper yoke 8 of the press frame 1.

The damping cylinder 19 in turn has, as shown in particular in FIG. 2 reveals one ring-shaped circumferential, compared to the annular piston collar 18 large central space 20. Downwards is at this Central space 20 is connected to a damping chamber 21 for the working stroke, a damping chamber towards the top 22 for the return stroke. The two damping chambers 21, 22 are via throttle bores 23 connected to the hydraulic chamber 20 with a device 24 for adjusting the throttling effect. - The return cylinder piston assembly 15 is connected to a compressed air source, not shown, namely via the lines 25 and 26 with corresponding control valves 27. It can be seen that the piston 16 of the resetting cylinder piston arrangement 15 has a piston rod 17 which is provided with pressure medium bores 28 is provided. These open into the cylinder space above or below the actual piston 16 29 of the cylinder 14.

The already mentioned annular piston collar 18 has, on the one hand, an orthogonal to the cylinder 14 The annular piston surface 30 which is immersed in the lower damping chamber 21. As already mentioned, this is used for the damping of the working stroke. The opposite annular piston surface 31 runs in contrast sloping towards the outside, it dips into the upper damping chamber 22 and serves to dampen the Return stroke. The device 24 for setting the throttling effect cooperates in the exemplary embodiment simple set screws 32 that dip with tips 33 in the throttle bores 23 and allow the To adjust the flow cross-section in the dro> be.

As a result, it is initially achieved that the annular piston or annular piston collar 18 both the still Dosed residual energy during the working stroke as well as the speed energy during the return stroke can. During the movement of this annular piston collar 18, however, there is no change in volume the central space 20 instead, which is made relatively large compared to the annular piston collar 18. That is of course also achieved in that the cylinder 14 itself above and below the Ring piston collar 18 has the same diameter. Consequently, with this movement of the press ram 4 an expansion tank is not required. It should also be noted that in the exemplary embodiment and according to a preferred embodiment of the invention, the cylinder 14 moves in a throttle gap 34 by the compressed oil can move up to a relief groove 35, from which it is back in the Oil tank is returned. As a result, the sealing elements remain pressureless at 36, so that they have a high Have service life.

Not only these devices for end position cushioning are integrated with the press ram 4 during the working stroke or the return stroke. Integrated with the

The press ram 4 is also the resetting device itself. It is housed in the press ram 4 and receives its air supply, as already described, through the piston rod 17 or piston holder. as The return spring force is, on the one hand, the increase in compression pressure of the air introduced on the one hand Side of the piston 16 of the return cylinder piston assembly 15 and the relaxation on the other side exploited. Surprisingly, there are only slight increases in temperature. Of special The advantage is the fact that the pressure can be built up in the opposite direction for set-up purposes (by switching over the valves already mentioned) so that the press ram 4 without electrodynamic Unloading can be moved into the working position.

For this purpose 2 sheets of drawings

Claims (1)

Patent claims: 1. High-speed punching press for processing sheet metal, sheet metal parts and the like with a fixed press table and workpiece holder in the press frame as well as a press ram that can be moved up and down with a press tool and electrodynamic drive, one concentric to the press ram arranged, supported on the upper yoke of the press frame, single or multi-layer flat coil ring and has a driver plate assigned to the press ram, characterized with end position damping and return of the press ram by combining the following features: