WO2018145957A1

WO2018145957A1 - Press having a double-acting hydraulic cylinder

Info

Publication number: WO2018145957A1
Application number: PCT/EP2018/052295
Authority: WO
Inventors: Paolo Matassoni; Stefan Kaiser; Ingo Goutier
Original assignee: Andritz Technology And Asset Management Gmbh
Priority date: 2017-02-09
Filing date: 2018-01-30
Publication date: 2018-08-16
Also published as: PL3580054T3; EP3580054B1; EP3580054A1; ES2890223T3

Abstract

The invention relates to a press (1) or automatic punch having a drive (6), which drives a plunger (10) in an oscillating manner via an eccentric shaft (5) and via at least one connecting rod (9), wherein the at least one connecting rod (9) is rotatably mounted on the eccentric shaft (5) at one end (30), and is connected to the plunger (10) at the other end (17). According to the invention, a double-acting hydraulic cylinder (27), which can be driven in a vibratory manner, is arranged in the connecting rod (9). The invention further relates to a method for operating a press (1).

Description

PRESS WITH DOUBLE-ACTING HYDRAULIC CYLINDER

The subject of this invention is a press or a punching machine with a drive oscillating about an eccentric shaft and at least one connecting rod a plunger

drives, wherein the at least one connecting rod is rotatably mounted at one end on the eccentric shaft and connected at the other end to the plunger. The subject of this invention also forms a method for operating a press or a stamping machine, in which a plunger is driven in an oscillating manner by means of an eccentric shaft and at least one connecting rod by a drive. Such presses have been known for a long time. The plunger moves back and forth between a lower and a top dead center. In these machines, the pressing or punching force is fed directly into the ram via one or more connecting rods (2 - or 4 - point presses). There are also possibly provided adjustments to adjust the stroke. This usually happens via a

Eccentric bush. The position of the plunger can also be adjusted via a ball screw at the lower end of the connecting rod (plunger adjustment).

The invention has for its object to provide a press or a stamping machine, in which the punching or forming process is improved. This task is solved by a press or a

Punching machines with one or more connecting rods in which or in which in each case a double-acting hydraulic

Cylinder is arranged, with the double-acting Hydraulic cylinder can be operated vibrating, so that thereby the punching or forming process by a

vibrating ram is performed. The fact that the hydraulic cylinder is arranged in the connecting rod, or that a hydraulic cylinder is arranged in each connecting rod, results in a very compact construction of the press.

Preferably, the double-acting hydraulic cylinder is housed in the connecting rod shank. It is also conceivable that the hydraulic cylinder is arranged below an overload fuse, directly above the plunger.

Sometimes it is necessary to carry out a check between the upper part of the tool and the lower part of the tool or even work on the tools. This is about the

Eccentric shaft of the plunger moved to the top dead center, in addition, the plunger adjustment is actuated and with the help of the ball spindle of the plunger further upwards

driven to thereby have more space between the tools available. By this process, however, only a very limited free space between the upper tool part and lower tool part is provided. In addition, the lifting of the plunger via the plunger adjustment takes a lot of time.

This is very disadvantageous, in particular in the case of try-out incorporation presses, since tool controls are very frequently used here

must be performed.

Now according to the invention in the power train between

Eccentric shaft and ram a double effect

Hydraulic cylinder is provided, can thus also realize a fast lift stroke. By the double-acting invention

Hydraulic cylinders are also working on the open

Tool especially simplified.

The ram is driven by the eccentric drive to the top dead center and then is on the

Double-acting Hydraulic ikzyl activated in the Lifthub. The Li thub, for example, has an opening travel of 140 mm. With a press stroke of 160 mm, a maximum opening travel of 300 mm can be realized. As a result, the press tool is easily accessible for optical inspection or work on it (e.g., grinding work).

Often, presses are also equipped with an overload fuse, which is usually arranged in the ram. The double-acting Hydraulic ikzyl indians can do this

used to increase the overload path. This also guarantees more efficient tool protection. Of the

But hydraulic cylinder can also function as a

Take over overload protection. In the event of a fault, i. In the event of an overload on the plunger, the oil in the hydraulic cylinder is then discharged, so that the piston travel in the hydraulic cylinder serves as a buffer. The fault can be determined either mechanically via differential pistons or via press force sensors.

The invention also includes a method for operating a press or a stamping machine, in which a plunger is driven oscillating via an eccentric shaft and at least one connecting rod of a drive. According to the invention, the plunger is also driven in addition via a double-acting hydraulic cylinders, which is arranged in the connecting rod, vibrating. The double-acting cylinder can do this in addition

used, with a necessary control or at

Working on the tool to realize a fast lift stroke of the ram resp. if necessary act as overload protection. On the one hand one loses as little time as possible and on the other hand has more space in the

Tool gap than in conventional presses for

Available. It is conceivable that the press is operated in such a way that the working stroke of the press only by the

double-acting cylinder is performed, the

Hydraulic cylinder is operated vibrating.

In this case, the upper end of the connecting rod in the upper (0 ° position) or bottom dead center (180 ° position), so that no rotational forces are introduced into the eccentric shaft. If there are multiple connecting rods, all will

Double acting cylinders in the respective connecting rods

operated vibratingly.

It is also conceivable that the working stroke of the press is performed by the eccentric drive and the double-acting cylinder. In the following an embodiment of the invention will be described with reference to three drawings. Show it :

Fig. 1 is a schematic view of the press according to the invention;

Fig. 2 is a detail view of the connecting rod; Fig. 3 is a functional diagram of the press; The same reference numerals in the accompanying drawings in each case designate the same components.

Figure 1 shows an example of a press 1 with a

Press table 2, side posts 3 and a head piece 4. In the head piece 4, the eccentric shaft 5 is rotatably mounted. A drive 6 drives via the drive belt 7 and the

Flywheel 8, the eccentric shaft 5 at. On the eccentric shaft 5, two eccentric bushes 32 are arranged, on each of which the upper end 30 of the connecting rod 9 via a

Roller bearing 14 is rotatably mounted. The upper end 30 of the connecting rod 9 is made of two screwed together

Halves 15, 16 composed. The lower ends 17 of the two connecting rods 9 are connected to the plunger 10. At the

Tappet 10, the upper tool part 12 is fixed, which can be pressed against the lower tool part 11 during operation. The plunger 10 is guided over the roller guide 13 along the side stand 3. FIG. 2 shows a connecting rod 9 according to the invention in detail. In the connecting rod 31 is here

double-acting hydraulic cylinder 27 arranged.

Within the cylinder 25, a piston 22 is arranged. Via the lines 24 or 26, the pressure chamber 23 or the annular space 28 can be acted upon with a hydraulic fluid and so the piston 22 can be raised or lowered. Due to the rapid alternate pressurization of the pressure chamber 23 and the annular space 28, the vibrating movement of the piston 22 is realized.

With the double-acting Hydraulikzy1 inder 27 can also realize a fast lift stroke of the plunger 10. It can also be seen in FIG. 2 that in the preceding example the lower end 17 of the connecting rod 9 is connected via a ball screw 18 to the plunger 10. The ball of the ball screw 18 is in the lower ball socket 20 and the upper

Ball socket 19 stored. With the help of the ball screw 18 and the spindle nut 21, the position of the plunger 10 can be adjusted in a known manner.

FIG. 3 now shows a functional diagram. The plunger 10 can on the one hand in a known manner on the rotating

Eccentric shaft 5 are driven oscillating. As a result, a ram stroke A can be realized. With the

The inventive double-acting hydraulic cylinder 27 can additionally realize the stroke B. The

Vibrating actuation of the hydraulic cylinder 27 takes place via the magnetic switch 29. The magnetic switch 29 alternately pressurizes the upper pressure chamber 23 or the lower annular space 28 with the hydraulic fluid so that the piston 22 vibrates, for example at a frequency of 20 Hz. In the illustrated position of the magnetic switch 29, the upper pressure chamber 23 is being filled via the line 24 with hydraulic fluid coming from the supply line P. At the same time, the lower annular space 28 is emptied via the line 26 into a tank T. The piston 22 moves so here the plunger 10 down. By means of the double-acting hydraulic cylinder 27, the plunger 10 can thus be raised and lowered very rapidly and thus operated vibrantly. The working stroke can be through the

Eccentric drive and the one or two-acting

Hydraulic ikzyl inder 27 are carried out together. The eccentric drive moves the vibrating

Hydraulic ikzyl inder 27 down so that the plunger 10 moves vibrating down. The working stroke can also only by the vibrating

be realized double-acting hydraulic cylinder 27, wherein the pressure chamber 23 during a working stroke in small surges slightly more hydraulic supplied ikflüssigkeit than subsequently discharged, so that the vibrating movement of the piston is superimposed a 1 ineare downward movement.

When the two lines 24 and 26 are closed, the piston 22 is blocked. Then the working stroke can be performed alone on the eccentric shaft 5 and the connecting rods 9 behave like conventional connecting rods without integrated hydraulic cylinder 27th

The ram adjustment can be realized with the help of the ball screw 18, a further stroke C, but this lasts j edoch quite a long time.

In the figures 2 and 3 are in each case only one

inventive connecting rod 9 is shown. Of course, in a press 1 with multiple connecting rods 9 all connecting rods 9 would have a double-acting hydraulic cylinder 27, which are vibrationally operable.

Claims

claims

1. Press or punching machine (1) with a drive (6) which oscillates via an eccentric shaft (5) and at least one connecting rod (9) a plunger (10), wherein the at least one connecting rod (9) at one end (30 ) is rotatably mounted on the eccentric shaft (5) and at the other end (17) connected to the plunger (10), characterized in that in the connecting rod (9) a double-acting hydraulic cylinder (27) is arranged, which is vibrationally operable.

2. Press or punching machine (1) according to claim 1, characterized in that the double-acting hydraulic cylinder (27) in the connecting rod shank (31) is arranged.

3. Press or punching machine (1) according to claim 1 or 2, characterized in that the double-acting hydraulic cylinder (27) via a magnetic switch (29) is actuated.

4. Press or punching machine (1) according to one of claims 1 to 3, characterized in that in the connecting rod (9) in addition to the double-acting hydraulic cylinder (27) and a

Ball indel (18) and a spindle nut (21) for

Plunger adjustment is arranged.

5. Method of operating a press or a

Punching machine (1), wherein a plunger (10) via a

Eccentric shaft (5) and at least one connecting rod (9) of one

Drive (6) is driven oscillating, thereby

characterized in that the plunger (10) is also driven in addition via a double acting hydraulic cylinder (27) disposed in the connecting rod shaft (31), the double acting cylinder (27) being operated vibratingly.

6. The method according to claim 5, characterized in that the working stroke of the press (1) is carried out only by the double-acting cylinder (27), wherein the upper end (30) of the connecting rod (9) is located at the top or bottom dead center.

7. The method according to claim 5, characterized in that the working stroke of the press (1) by the eccentric drive and the double-acting cylinder (27) is performed.