DE1201660B - Standing counterblow hammer - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. CL:

Number:
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B 23 j

German class: 49g-1

1201 660
E15922Ib / 49g
May 24, 1958
September 23, 1965

The invention relates to a standing counterblow hammer for open die forging and Drop forging, using a hydraulic drive.

In the upper pressure forging hammer of the main patent, in which the bear for the upward gear over the lower piston ring surface and for the downward gear over the total piston surface of the top is charged with operating fluid, with a lockable connection between the piston upper and piston bottom as well as a control for the reversal points is present, is located between the pump with constant flow rate and the cylinder chambers exclusively with liquid filled container, the liquid of which is constantly under high pressure and as a hydraulic spring works. The period of natural oscillation of the system (piston-bear-liquid) is in the range of Fall and lift time. The hydraulic oscillating drive works with this overpressure forging hammer with a liquid spring, the effect of which is solely on the compressibility of the hydraulic fluid is based. The resulting in such a vibratory drive considerable Pressure fluctuations to greatly differing acceleration forces for the bar mass. The vibratory drive has a high gait due to its good adaptation to the gait typical of a hammer Efficiency on. The hydraulic fluid does not need to be cooled.

The invention relates to the application of the above-mentioned principle of the hydraulic Vibratory drive with the liquid spring, according to the main patent, on standing counterblow hammer, which have bars in a known manner, which are connected to pistons running in separate cylinders and have no direct hydraulic coupling. The one from the two bears and the one exclusively with liquid-filled container existing and over the effective piston areas of the The piston of both bears coupled hydraulic vibratory drive results in the operation of the Counterblow hammer the advantages of an unusually high degree of efficiency and the omission of a Cooling of the drive medium. There is also no need for the drive to be coupled independently of the drive Hammer bears.

For hydraulic impact energy damping on the lower bear, known per se, two Damping piston can be arranged, which has a check valve with the container and a check valve are connected to the collection container.

Standing counterblow hammer

Addendum to the patent: 1184 603

Applicant:

EUMUCO Aktiengesellschaft für Maschinenbau, Leverkusen

Named as inventor:

Harald Hassel, Opladen;

Fritz Riemenschneider, Leverkusen

The cylinder chambers are in the counter-blow hammer hydraulically operated in the specified manner the piston of the two bears not only with the hydraulic fluid container, but also with the collecting container in connection, with the latter lying over the piston Spaces. Each line connected to the spaces above the piston contains shut-off devices, which are mutually alternately controllable depending on the movement of the hammer bear. aside from that check valves are arranged in these lines. An automatic pressure switch leaves the recoupling of the hammer bears in the retreat end positions to compensate for bouncing blows only closes when a predetermined fluid pressure is reached.

An exemplary embodiment of the subject matter of the invention is shown schematically in the drawing.
The counter-blow hammer has two rams 2 and 3 rising and falling in the hammer frame 1, which are connected to the pistons 6 and 7 via the piston rods 4 and 5. The spaces 8 and 9 below the pistons 6 and 7 are in open connection with the container 10 containing the elastic pressure fluid volume. From a pump

11 with a constant flow rate leads a line

12 via a check valve 13 to the container 10. The pump is in a known manner with the by the Shut-off element 14 controllable circulation line 15 connected. From the container 10, the line 12 leads over Line 16 and over the reversing slide 17 into the cylinder chamber 18. It also leads over the

509 688/137

Reversing slide 17 and line 19, via check valve 20, into space 21. In addition the cylinder space 18 is connected to the container 10 via the check valve 22. The cylinder space 18 can also be via the reversing valve 17, the gate valve 23 and the line 24 with the Collecting container 25 are connected. The same applies to the cylinder space 21.

The cylinder spaces 26 of the receiving flasks 27 are connected to the container via the check valve 28 10 and via the check valve 29 with the collecting container 25 in connection.

The pressure switch 30 and the safety valve 31 are connected to the container 10 via the line 12.

The operation of the counter-blow hammer according to the invention is as follows: The pump 11 delivers uninterrupted both during the impact stroke and the retraction stroke with a constant flow rate in the container 10. It is only switched to unpressurized circulation via the circulation device 14, 15, when bears 2 and 3 are to stop. If the bears are in the final position of retreat, then the pressure in the hydraulic fluid container 10 increases until the pressure switch 30 responds, which the reversing slide 17 and the gate valve 23 switches so that the cylinder space 18 is in communication with the hydraulic fluid container 10 via the slide 17. At the same time is the cylinder space 21 via the line 19, the slide 17 and 23 and the line 24 with the collecting container 25 connected. As a result, the lower ram is lifted by the pressure on the entire lower piston surface accelerates upwards against its own weight, while the upper bear falls and additionally accelerated downwards with the pressure on the surface corresponding to the piston rod cross-section will.

Shortly before the strike, one of the two bears activates a preferably electrical release device actuated for the reversing slide 17, which switches this so that the cylinder chamber 21 over the line 19, the slide 17 and the line 12 are connected to the container 10 and the cylinder space 18 via the line 16, the slides 17 and 23 and the line 24 to the collecting container 25 communicates. This is the upper bear by the pressure on the lower ring surface of the Piston 6 raised. The lower bear falls by its own weight against the pressure in the cylinder space 9 to the difference in piston areas corresponding to the piston rod cross-section.

Before the upper end position of the upper bear, the upper bear creates a preferably electrical Triggering device for the gate valve 23 actuated, which closes it. The hydraulic fluid in space 18 must now be pressed through the check valve 22 into the container 10. Through this the upper bear is slowed down and brought to a standstill. Since in this phase of the stroke the pressure fluid flow from the spaces 18 and 9 in the pressure vessel 10 is much larger than the drain in the spaces 8 and 21 and also the pump promotes in the pressure vessel, the increases The pressure is so strong that the lower bear is also slowed down. In the end position of the bear 3 the pressure is in the rooms 9 and 21 so big that the bear would rise again immediately. He will mind, however prevented by the check valve 20, which prevents the outflow of the pressure fluid from the space 21 locks.

Because the falling energy of the lower bear is not always fully absorbed due to the occurrence of bouncing blows can be, are located just before the end position of the bear, the receiving flask 27, which convert the residual energy of the lower ram into compression energy of the pressure fluid in the container 10. This energy is available for the next strike.

The bears now stand there until the pressure set on the pressure switch 30 is reached, and the game begins again.
Since difficult die parts often lead to

ao reduction of the number of strokes is desired, the number of strokes can be reduced by the fact that during of the retraction stroke by an electrical time relay, the circulation device automatically temporarily is switched to circulation.

Claims (2)

Patent claims: 1. Use of the hydraulic spring drive of an overpressure forging hammer, one filled exclusively with liquid under constantly high pressure Container between the piston top and bottom is arranged, the liquid content is chosen so that the natural period of oscillation of the system (piston-bear-liquid) in the The range of the fall and lift time lies, the container with a pump with a constant flow rate is in communication and the upper cylinder space can be shut off from the container and there is a lockable connection between the upper cylinder space and the collecting container is, furthermore a fluid pressure-dependent and a path-dependent switching of the shut-off devices is provided, according to patent 1184 603, on standing counterblow hammer, which is known in Wise bears (2, 3) have, with pistons (6, 7) running in separate cylinders are connected and have no direct hydraulic coupling. 2. Standing counterblow hammer according to claim 1, characterized in that the to known, hydraulic impact energy damping on the lower bear (3) two damping pistons (27) are arranged, which via a check valve (28) with the container (10) and a check valve (29) are connected to the collecting container (25). Considered publications:
German Patent Nos. 876 795, 869 894, 727 347, 641612, 630111; British Patent No. 510,890;
U.S. Patent No. 2220037;
Journal "Konstruktions", 1957, no. 8, pp. 294 to 299. For this purpose, 1 sheet of drawings 509 688/137 9.65 © Bundesdruckerei Berlin