DE1201661B - Horizontal counterblow hammer - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. α .:

B 23 j

German class: 49 g -1

Number: 1201 661

File number: E159231 b / 49 g

Filing date: May 24, 1958

Opening day: September 23, 1965

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

In the case of the upper pressure forging hammer of the main patent, in which the bar for the upward gear is over the lower piston ring area and for the downward gear over the total piston area of the top with operating media is acted upon, with a lockable connection between the piston top and piston bottom as well as a control for the reversal points is available, is located between the pump with constant flow rate and the cylinder chambers a container filled exclusively with liquid, whose liquid is constantly under high pressure and acts as a hydraulic spring. Here lies the Natural oscillation period of the system (piston - bear - liquid) in the area of the fall and lift time. In this overpressure forging hammer, the hydraulic oscillating drive works with a liquid spring, whose effect is based solely on the compressibility of the hydraulic fluid. Lead here the considerable pressure fluctuations occurring in such a vibratory drive differ too greatly Acceleration forces for the Bärm # sse. The vibratory drive is due to its good Adaptation to the gait typical of a hammer has a high degree of efficiency. A cooling of the Hydraulic fluid is not required.

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 lying counter-blow hammer, which, in a known manner, have bears connected to pistons running in the separate cylinders are and do not receive a direct hydraulic coupling and which, as is known per se, with a device are provided to ensure the synchronization of the two bears. Here the two of them get Bears always get the same impulse to move hydraulically. Additional facilities, e.g. B. a magnetic over-position indicator is not required. The bears have been synchronized from the start preserved. Furthermore, it follows according to the invention that the impact energy is not lost; because the Hydraulic fluid is fed directly into the fluid spring of the actuator via check valves pressed and increases their tension. Furthermore, since no impact energy is converted into heat, no harmful heating of the oil circuit occurs. The bears don't rock back either, but rather are retarded by the piston with a recumbent counter-blow hammer

Addendum to the patent: 1184 603

Applicant:

EUMUCO Aktiengesellschaft für Maschinenbau, Leverkusen

Named as inventor:
Harald Hassel, Opladen;

Fritz Riemenschneider, Leverkusen

moderately small piston area in the starting position pushed back.

The horizontal construction of a counter-blow hammer is known in principle. Furthermore are lying counter-blow hammer with an arrangement of electrical means known to a striking of the two bears in a constant central plane. At another counterblow hammer In which the transfer of motion from one bear to the other takes place via a hydraulic linkage, one has, however only to alleviate pressure surges, already one branching off from the hydraulic connecting rod and provided a column of liquid loaded by an air cushion. Here the energy of Shocks destroyed, d. H. converted into heat, and the bears teeter until the impact energy comes through Has converted damping into heat.

These brake pistons can be connected downstream for braking and returning the pistons to their starting position on which further pistons are arranged, one of which is cylinder spaces with the collecting container via check valves or with the container via check valves and their others Cylinder spaces are directly connected to the container.

The drawing illustrates an exemplary embodiment of the subject matter of the invention in schematic form Depiction.

The horizontally working counter-blow hammer has two pistons that can move in the frame 1 2 and 3, which are connected to the pistons 6 and 7 via the piston rods 4 and 5. The rooms 8

509 688/133

and 9 between the bear and the piston stand with the container containing the elastic pressure fluid volume 10 in open connection.

A line 12 leads from a pump 11 with a constant delivery rate via a check valve 13 to the container 10. The pump can also be controlled in a known manner with the one controlled by the shut-off element 14 Circulation line 15 connected. A connection leads from the container 10 via the line 16 and the Line 17 to the cylinder chambers 8 and 9. A line 20 leads from the pump 11 via a slide valve 21 and from this via the line 22 to those located on the outer sides of the pistons 6 and 7 Cylinders 18 and 19.

The pistons 6 and 7 are followed by further pistons 23 and 24, with which pistons 25 and 26 are connected. The cylinder spaces 27 and 28 are connected to the collecting container via the lines 29 and 30 31 in connection. The cylinder spaces 32 and 33 are connected to the line 17. The one with the The line connected to the hydraulic fluid volume 10 is via a check valve 34 and 35 each connected to lines 29 and 30, in which check valves 36 and 37 are arranged.

The pressure switch 39 and is connected to the line 38 leading from the line 16 to the collecting container 31 the safety valve 40 connected.

The same return end position is always achieved by braking by means of pistons 23 and 24. The pistons 6 and 7 or the bears 2 and 3 can be advanced again through the pistons 25 and 26 until the pistons 23 and 24 come to rest against the stops 41 and 42. This will get the bears 2 and 3 each time in the same starting position as a precondition for the synchronization of both bears. the Stops 41 and 42 can be arranged displaceably and adjustable in the direction of the piston axes. Different impact strengths are achieved by switching the slide 21 earlier or later.

The horizontal counterblow hammer works as follows:

The pump 11 delivers uninterruptedly with a constant flow rate into the container 10. It is only then switched to unpressurized circulation via the circulation device 14, 15 when the bears 2 and 3 should stop. If the bears are in the final retraction position, the pressure in the hydraulic fluid container rises 10 until the pressure switch 39 responds. This switches the slide of the reversing slide 21 to the left and thereby connects the cylinder spaces 18 and 19 via the lines 22 and 12 with the container 10. The cylinder spaces 8 and 9 are via the lines 16 and 17 constantly with the Container 10 connected. Since the entire piston area receives pressure in the spaces 18 and 19, in the If 8 and 9 only clear a ring area, bears 2 and 3 will accelerate towards the middle. Shortly before the impact, the reversing slide is actuated by a preferably electro-hydraulic release device 21 switched back to the initial position shown. Rooms 18 and 19 are therewith Reconnected to the collecting container 31 via the line 22 and the reversing slide 21. the Bears 2 and 3 are going back. The spaces 18 and 19 emptied into the collecting container 31. In the end position, the bears 2 and 3 are braked by the pistons 23 and 24, the considerably larger ones Cross-sectional areas than the Bar pistons 6 and 7 have. The bears exceed the final position. the Hydraulic fluid from the spaces 27 and 28 escapes through the check valves 34 and 35 into the Pressure vessel 10 and compresses the pressure fluid volume. The braking energy is thereby for harnessed the following blow. The cross-sectional areas of pistons 25 and 26 are somewhat larger than the piston ring area in spaces 8 and 9, and since spaces 8, 9, 32 and 33 over the Lines 16 and 17 are constantly under pressure, the bears are now slowly pushed back into their starting position, d. H. until the pistons 23 and 24 rest against the stops 41 and 42. The bear speed This is achieved by throttles (not shown) in the supply line to rooms 32 and 33 regulated. The spaces 27 and 28 suck each other through the check valves 36 and 37 full of hydraulic fluid. Now the pressure in the container 10 rises until the pressure switch 29 responds and a new game begins.

Claims (2)

Patent claims: 1. Use of the hydraulic spring drive of an overpressure forging hammer, with a liquid-filled one that is exclusively under constant high pressure The container is arranged between the top and bottom of the piston, the liquid content of which is selected so that the natural period of oscillation of the system (piston - bear - liquid) is in the range of the fall and lift time, 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 a lockable connection between the upper cylinder space and the collecting container is provided, wherein there is also a fluid pressure-dependent and path-dependent circuit of the one shut-off element is provided, according to patent 1184 603, on lying counter-blow hammer, which is known in Wise bears (2, 3) have the pistons (6, 7) running in the separate cylinders are connected and have no direct hydraulic coupling and which, as is known per se, are provided with a device to ensure the synchronization of the two bears (2, 3). 2. Horizontal counter-blow hammer according to claim 1, characterized in that the Pistons (6, 7) are connected downstream of brake pistons (23, 24) on which further pistons (25, 26) are arranged are whose cylinder spaces (27, 28) with the collecting container (31) via check valves (36, 37) or with the container (10) via check valves (34, 35) and their cylinder spaces (32, 33) are directly connected to the container (10). Considered publications:
German Patent Nos. 913 018, 907 617, 796, 869 894, 727 347;
British Patent No. 510,890;
Journal "Konstruktions", 1957, no. 8, p. 294 to 297. 1 sheet of drawings 509 688/138 9.65 © Bundesdruckerei Berlin