DE2332620C3

DE2332620C3 - Cutting impact damping device on cutting presses

Info

Publication number: DE2332620C3
Application number: DE19732332620
Authority: DE
Inventors: Horst 7320 Göppingen Pfisterer
Original assignee: L Schuler GmbH
Current assignee: L Schuler GmbH
Filing date: 1973-06-27
Publication date: 1977-11-17

Description

Fig. 1 einen lotrechten Schnitt einer ersten Ausführungsform, Fig. 1 is a vertical section of a first embodiment,

Fig. 2 einen lotrechten Schnitt einer zweiten Ausführungsform,Fig. 2 is a vertical section of a second embodiment,

Fig. 3 einen lotrechten Schnitt einer dritten Ausfüh- $ rungsform,Fig. 3 is a vertical section of a third embodiment form,

Fig. 4 eine auf wenige Teile der Presse beschränkte Seitenansicht zu F i g. 2.4 shows a side view of FIG. 4 limited to a few parts of the press. 2.

In einen Gestell 1 einer Presse ist eine über ein Schwungrad 2 angetriebene Kurbelwelle 3 gelagert, durch die über Pleuel 4 ein in dem Gestell 1 geführter Stößel 5 abwäits und aufwärts bewegbar ist. An dem Stößel 5 ist mindestens ein Schnittstempel 6 befestigt, durch den aus einem über mindestens eine auf einem Tisch 7 der Presse fest angeordnete Matrize 8 geführten, band- oder tafelförmigen Vorwerkstück 9 Platinen 10 ausgeschnitten werden. In dem Stößel T ist mindestens ein Zylinder Il fesi angebracht, in dem ein mit dem Stößel 5 gleichlaufend angetriebener Kolben 12 lotrecht beweglich geführt ist.In a frame 1 of a press is one over a Flywheel 2-driven crankshaft 3 is supported, through which a connecting rod 4 is guided in the frame 1 The plunger 5 can be moved downwards and upwards. At least one cutting punch 6 is attached to the ram 5, through the guided out of a die 8 fixedly arranged on a table 7 of the press via at least one, strip or panel-shaped preliminary workpiece 9 blanks 10 are cut out. In the tappet T is at least a cylinder Il fesi attached, in which one with the Plunger 5 parallel driven piston 12 is guided vertically movable.

Bei der ersten Ausführungsform (Fig. 1) erfolgt der Antrieb des Kolbens 12 mittels eines von der Kurbelwelle 3 angetriebenen Zusatzplcuels 13. In den von den Kolben 12 abgeschlossenen Druckflüssigkeilsraum 14 mündet eine über ein Rückschlagventil 15 zu einem mit Druckluft beaufschlagten Druckübersetzer 16 führende Druckflüssigkeitsleitung 17. In einer parallel dazu geschalteten Druckflüssigkeitsleitung 18 befindet sich eine Drossel 19.In the first embodiment (Fig. 1) takes place The piston 12 is driven by means of an additional plug 13 driven by the crankshaft 3 A pressure fluid wedge chamber 14 closed off by the piston 12 opens into a non-return valve 15 a pressure booster 16, which is acted upon by compressed air, and carries hydraulic fluid line 17. In a parallel A pressure fluid line 18 connected to this is a throttle 19.

Bei der zweiten Ausführungsform (F i g. 2,4) weist die Kurbelwelle 3 seitlich des Gestelles 1 je eine zusätzliche Kurbel 20 auf, auf der ein llilfspleuel 21 gelagert ist. Die Hilfspleuel 21 erteilen in dem Gestell 1 gelagerten Hebeln 22 Drehbewegungen. An dem Stößel 5 zugekehrten Armen 23 der Hebel 22 greifen Zusatzpleuel 24 an, die die Kolben 12 antreiben. In dem Stößel 5 ist ein Druckflüssigkeitsspeicher 25 angeordnet, der über ein Rückschlagventil 15 und eine zu diesem parallel geschaltete Drossel 19 mit einer zu den beiden Druckflüssigkeitsräumen 14 führenden Druckflüssigkeitsleitung 26 verbunden ist.In the second embodiment (Fig. 2.4), the Crankshaft 3 on the side of the frame 1 each have an additional crank 20 on which a llilfspleuel 21 is mounted. the Auxiliary connecting rods 21 give levers 22 mounted in the frame 1 rotary movements. On the plunger 5 facing arms 23 of levers 22 attack additional connecting rods 24 which drive pistons 12. In the pestle 5, a hydraulic fluid reservoir 25 is arranged, which has a check valve 15 and a parallel to this switched throttle 19 with a hydraulic fluid line leading to the two hydraulic fluid spaces 14 26 is connected.

Bei der dritten Ausführungsform (Fig. 3) ist eine in dem Tisch 7 der Presse gelagerte, doppelt gekröpfte und die Kolben 12 über Zusatzpleuel 13 antreibende Zusatzkurbelwelle 27 vorgesehen, die über einen schlupffreien Zwischentrieb 28 gleichlaufend mit der Kurbelwelle 3 angetrieben ist. Von einer aus einem Behälter 29 ansaugenden, mittels Motores 30 angetriebenen Pumpe wird den Druckflüssigkeitsräumen 14 über ein Rückschlagventil 15 und eine Druckflüssigkeitsleitung 31 Druckflüssigkeit zugeführt. Eine eine Drossel 19 und ein Rückschlagventil 32 enthaltende Leitung 33 führi zu dem Behälter 29 zurück.In the third embodiment (Fig. 3) is an in the table 7 of the press mounted, double cranked and the piston 12 via additional connecting rods 13 driving Additional crankshaft 27 is provided, which runs concurrently with the via a slip-free intermediate drive 28 Crankshaft 3 is driven. From a suction from a container 29, driven by a motor 30 The pump is the hydraulic fluid spaces 14 via a check valve 15 and a hydraulic fluid line 31 Hydraulic fluid supplied. A throttle 19 and a check valve 32 containing Line 33 leads back to the container 29.

Hierzu 3 Blatt ZeichnungenFor this purpose 3 sheets of drawings

Claims

Patent claims:

1. Cutting impact damping device on cutting presses with at least one el '"working movement of the press ram against '. end on this attacking cylinder-piston unit, the has a Druckfiüssigkeitsraum to which a throttle is connected, via which of a Position of the plunger can be derived from hydraulic fluid, characterized in that with mechanical Cut-press the cylinder-piston unit (U, 12) arranged in the plunger (5) and you part (cylinder 11 or piston 12) that is not permanently connected to the plunger (5) runs concurrently with the plunger (5) can be driven.

2. Cutting impact damping device according to claim 1, characterized in that the concurrent with the plunger (5) drivable part (cylinder 11 or piston 12) and the shocks! (5) by a single shaft (3) are driven (Fig. 1).

3. Schniuschlag damping device according to claim 1, characterized in that the drive (27) of the part (cylinder 11 or piston 12) in the table (7) that can be driven simultaneously with the ram (5) the press and is drivingly connected to a shaft (3) of the drive of the ram (5) (Fig. 3).

4. Cutting impact damping device according to claim 1, characterized in that the concurrent with the plunger (5) drivable part (cylinder 11 or piston 12) by a synchronous with the plunger (5) driven crank (20) derived via an auxiliary connecting rod (21) and one that is fixed to the frame Lever (22) is driven (Fig. 2.4).

.5.5

The invention relates to a cutting impact damping device according to the preamble of the patent claim '.

In a known damping device of this type (DT-OS 14 27 403) impact surfaces are on the Cylinder-piston units on the one hand and the plunger on the other hand are provided over the during each Working movement of the plunger the operative connection of the plunger with the damping device abruptly produced and thus the discharge of hydraulic fluid from the hydraulic fluid spaces in the cylinder-piston units is initiated via the throttle.

A major disadvantage of this known damping device consists in the fact that with each working movement of the ram an impact blow to the Impact surfaces occurs, by which an impact noise is caused

The object of the invention is, as in the case of the main application (P 22 48 024.6-14), the creation to avoid these impact noises.

According to the main application, the solution to this problem is that the cylinder-piston unit has a piston dividing its interior into two pressure fluid chambers with a continuous piston rod and the two pressure fluid chambers are connected to one another with the interposition of a locking member, the actuation of which in the closing sense during the working movement the discharge of hydraulic fluid through the throttle. The essence of this measure consists in the fact that _the operative connection between the press parts in their movement towards / turning and the damping mechanism ^dam S remains. On this principle is based ^tUng h Z solution according to the present invention, they Γ? But other means. The solution to the ^b Tnnten Au would exist, according to the invention, the μ Sn of the characterizing part of patent claim 1.

mbe the mutually movable parts of the -7 r W piston unit are constantly connected to the plunger of a- ^Zy , andί the drive elements for the synchronous-Ti drive of the part that is not firmly connected to the plunger. During a Arbeus- • "iine! The plunger move initially I hasten Zvlinder-piston unit, the cylinder and, concurrently, the trapped ^ liquid virtually no change in its _disposal volume and in her t resting pressure is exposed. Be. continued Arsis t ewegung the plunger and starting mi, the iursezen a Schnittsiempels a μ on emer Vri / p resting preliminary workpiece is a genngfü-! £ ^{Γ ΐ} ^ screening of parts of the cylinder-piston Ε, η-eh? to each other in the sense of an increase in the volume available for the pressure fluid κ rvoi occupations, whereby the pressure in the pressure fluid Khende can decrease slightly. This shift corresponds to the elongation that occurs during the increase in the cutting resistance of the tension and compression of the parts of the press that are exposed to pressure in the force flow. With _the ^P em ^Ch cutting punch through the pre-workpiece, the cutting process decreases, which means that the parts of the press that were previously stressed for stretching and compression are relieved of tension and that the parts of the press that were previously subjected to stretching and compression are relieved and the process is rebuilt prior to the start of the cutting process had been present stress state fowie a change of direction in the Lagersp.elen the bearing involved caused is the schlagen.- JZ, noise-causing flow of these processes I kt Soch in the cylinder-piston unit! closed pressure fluid characterized steaming Tnteeeen that its volume by displacement of the Parts of the cylinder-piston unit is reduced to each other, ca the drive _{elements of the synchronous with 4} , the ram driven part of the cylinder-piston unit are not arranged in the power flow of the work movement of the plunger and from the relaxation of the parts lying the power nut remain unaffected. The increasing pressure of the hydraulic fluid in the cylinder piston unit is then reduced by draining hydraulic fluid through the throttle, while at the same time relieving the parts in the force flow of the working movement of the plunger. This process can be influenced by adjusting the throttle. The amount of hydraulic fluid that flows off through the throttle per working movement of the plunger and then has to be supplied again is small.

Several beneficial ways to run of the drive of the part of the cylinder-piston unit that is driven simultaneously with the plunger 6o specified in claims 2 to 4. For the choice of the appropriate design in each individual case In particular, the spatial conditions at the press and the forces that occur are decisive 65 The drawing shows examples for the Invention of three cutting presses with cutting impact damping devices shown schematically, namely shows