DE1240370B - Horizontal forging or upsetting machine - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. CL:

B21j

German KL: 49 h -3/01

Number: 1240 370

File number: E 25372 I b / 49 h

Filing date: August 21, 1963

Open date: May 11, 1967

The invention relates to a horizontal Schmiedebzw. Upsetting machine with a crankshaft driven, tool slide that can be moved horizontally to and fro and one for this purpose via a toggle lever drive vertically movable down or clamp holder carriage, its toggle lever drive from the crankshaft is derived via an intermediate drive, which is a substantially horizontally movable, on the toggle lever attacking pull and push rod, one with the pull and push rod articulated Double arm lever, an articulated lever located between the double arm lever and the crankshaft and an auxiliary lever which normally bears against a stop point under spring pressure and thus in a dead center passage preventing, determined by the stop point Normal position is from which it is when the normal clamping pressure is exceeded against the spring force swings out.

In such a forging or upsetting machine known from US Pat. No. 2121119 is the auxiliary lever that determines the normal position in connection with an attachment point designed as a one-armed lever, wherein the stop point is outside of the power transmission system. In normal position lies against this Stop one end of the auxiliary lever at which one of several levers is also at this point existing lever linkage is articulated, which serves to transmit the spring force to the auxiliary lever. The arrangement applying the spring force or the spring pressure is also outside the actual one Transmission system arranged. In this known arrangement, there is the overload device from a large number of components forming the lever linkage, so that a more complicated and failure-prone Mechanism results, which is extremely disadvantageous, especially in a forging or upsetting machine is because the overload device has to withstand considerable stress and is still in should be able to respond quickly and easily if, as a result of the occurrence of z. B. Breakdowns the overload device needs to be activated.

In the German utility model 1826030 is an overload device shown in which the power transmission from the drive member to the Tool takes place via a pull and push rod, which at one end via articulated and double-arm levers is connected to the drive member, while it is also pivotable at the other end is attached to a crank. On the drive system of the horizontal forging or upsetting machine

Applicant:
David Etchells (Machinery) Limited,

Darlaston, Staffordshire (UK)

Representative:

Dr. W. Schalk, Dipl.-Ing. P. Wirth,
Dipl.-Ing. GEM Dannenberg

and Dr. V. Schmied-Kowarzik, patent attorneys,
Frankfurt / M., Große Eschenheimer Str. 39

Named as inventor:
Henry Frost,
Wolverhampton, Staffordshire (UK)

Claimed priority:

Great Britain August 22, 1962 (32182) - -

a spring force is transmitted via two levers, one on the rod and one on the rod End of the spring bracket is hinged, while the second lever on the first lever and on the crank is hinged. Although this known device already has fewer items for the transmission of the Spring force on the drive system is required as the known device described above with the arrangement according to the German utility model 1826 030 still two Lever required, so that this arrangement is also relatively complicated and prone to failure. However, this device also differs from the device according to the invention in that that no toggle lever drive is provided, but a crank to transmit the clamping force, but what is without any essential influence.

A device described in U.S. Patent 1,975,537 has a main drive member, which is pivotally connected to an intermediate member mounted on a shaft, which of a reciprocating drive carriage. The intermediate link is usually prevented from rotating around the shaft by a spring and lever system. In case that the to-and-fro movement of the drive member by disrupting the movement of the hold-down tool is prevented, the intermediate link rotates

709 579/237

around the shaft and takes its linkage accordingly back on the drive member, shortening the push rod length and causing damage the drive parts of the machine are avoided. The safety mechanism is also in this device very complicated and therefore very prone to failure due to the high stresses that occur.

In the magazine "Werkstattstechnik", special section "Schmiedetechnische Mitteilungen", issue 8/1959, p. 461 to 468, are fog! ' Overload safety devices operated by spring pressure and safety devices mentioned with hydraulic actuation, but this does not give any suggestion, such as a Device of the type described above with few, reliable and non-failure-prone means with a. Overload protection can be equipped.

The invention is based on the object of providing a horizontal forging or upsetting machine create, in which the overload protection is equipped with few and reliably working individual parts is.

To solve this problem, the new horizontal forging or upsetting machine is based on a device of the type described above, characterized in that the auxiliary lever is a double-arm lever in the intermediate drive between the double arm lever on the crankshaft side and the pull and Push rod is articulated that the stop for a pivot point of the double arm lever on the The pull and push rod is fixed and that the one acting on the pull and push rod Spring device on the other hand to the normal position above the axis of the pull and Push rod between the attachment point and the hinge point to the pull and push rod hinge point of the double arm lever attacks. The design of the auxiliary lever as a double arm lever and in that the spring force between the pull and push rod and the pivot point of the auxiliary lever acts, with the stop still being arranged in a stationary manner on the pull and push rod, a considerable Reduction of items received, d. That is to say, it can apply in particular to that in the case of the known devices the lever linkage required to transmit the spring force can be dispensed with.

According to an advantageous embodiment, instead of the spring device in known Way a pressure medium device can be provided. This has the advantage that when the cylinder is in the one direction is pressurized, he presses the auxiliary lever against the stop and him during the normal working conditions of the machine. However, if the intention is to use the low or Clamp holder slide for the purpose of inspection or adjustment or readjustment of the upsetting tool to lift, the cylinder can be pressurized in the opposite sense to to operate the toggle levers so that they raise the movable hold-down carriage.

The invention is explained below with reference to the drawings, for example, namely shows

F i g. 1 shows a side view of a forging machine according to the invention for upsetting or pressing,

F i g. 2 a side view of the upsetting tool and the slide of the hold-down tool actuating Mechanism with the parts shown in the positions they require in FIG. Take 1,

F i g. 3 the same view as FIG. 2, in which, however, the overload protection is swiveled out,
F i g. 4 is a rear view of FIG. 2.
The drawings, in particular FIG. 1, show a machine frame 10 with a horizontally movably mounted tool slide 11, a machine-fixed holding tool 12 for holding the workpiece when the upsetting tool or head 13, which is supported on the slide 11, is operated

ίο is, and a movable upper tool 14 for Gripping or holding down the workpiece on the holding tool 12, with the upper tool 14 on a hold-down or clamp carriage 15 is mounted, which is vertically movable in the frame and is operated by a toggle lever 16. The carriage 11 of the upsetting tool 13 is controlled by a crank 17 moved back and forth from a main or drive shaft 19 via a drive rod or connecting rod 18, driven by a motor 20 via an endless belt 21 and a flywheel and in Rotation is displaced, with a rearward extension of the connecting rod 18 via a toggle rod 24 is connected to one end of a 'double arm lever 25 which is pivotably mounted on a shaft 26 is.

A pull and push rod 27 which stretches the toggle lever 16 for the carriage 15 of the hold-down device 14 and kinks, is at the upper end of the double arm lever 25 via a pivotable, also as a double arm lever trained auxiliary lever 28 connected, which is normally almost in line with the the toggle lever actuating pull and push rod 27 is located (as indicated in FIG. 2 by center lines is), but is prevented by a stop 29 from moving through a dead center position, wherein the stop between side tabs on the rear part of the pull and push rod 27 is rigid is attached, extends downward and on the pivot that the auxiliary lever 28 with the double arm lever 25 connects, comes to the plant.

A double-acting pressure cylinder 30 with a piston 31, which is a "third connecting link" represents variable length, connects the auxiliary lever 28 to a point of the pull and push rod 27, which lies in front of the point at which the auxiliary lever 28 is articulated to the double-arm lever 25.

The arrangement is made so that under normal working conditions, as in FIG. 2 shown, where the cylinder 30 is under pressure in the sense that the auxiliary lever 28 is held in contact with the stop 29 is, each workpiece to be machined between the locking tool 12 and the hold-down 14 held during the upsetting activity of the tool 13 and then released for removal is, whereupon the next workpiece, during the retracted position of the tool 13, the is now ready for the next operation, takes its place. When the crank 17 is its rear Approaching dead center and this runs through reversing the direction of movement of the slide 11, the articulated lever 24 pivots about its connection with the double-arm lever 25, without this in To move movement, whereby after each Preßbzw. There is a pause during the compression stroke the double arm lever 25 remains in its position and the slide 15 of the hold-down device in completely remains in the raised position to enable the workpieces to be replaced. Instead, could

the double arm lever 25 can also be actuated by a rotating cam wedged onto the crankshaft and profiled so that it ensures the required standstill.

In the event of a malfunction which prevents the hold-down device 14 on the slide 15 operated by the toggle lever from assuming the holding position, the further movement of the double-arm lever 25 causes the auxiliary lever 28 to counteract the action of the piston around its pivot point with the control arm 27 actuating the knee joint Cylinder arrangement 30, 31 pivots so that the pull and push rod 27 pivots only about its connection with the toggle lever 16, but without actuating it, whereby the mechanism is protected from overload and damage is prevented.

If the slide 15 of the hold-down device is not in its fully raised or retracted position when the machine is at a standstill, be it to correct a malfunction or to adjust or replace a tool, the auxiliary lever 28 can be activated independently of the double-arm lever 25 by suitable pressure in the cylinder 30 in the opposite sense are operated in order to lift the carriage 15 of the hold-down completely. When the slide 15 is in its fully raised position when the machine is at a standstill, suitable pressure in the cylinder ensures that it is held in this position while a malfunction is rectified, whereupon pressure in the cylinder 30 in the original sense ien auxiliary lever 28 in its normal Returns position, which is determined by the stop 29 , whereupon: r performs its normal activity, the auxiliary lever 28, which is only at a small angle to the pull and push rod 27, during this activity as a strut or support between the double arm lever 25 and the push and pull rod 27 is used to set this reciprocating motion in accordance with the oscillation of the double arm lever 25.

Claims (2)

Patent claims: 1. Horizontal forging or upsetting machine with a crankshaft-driven, horizontally reciprocating tool slide and a clamp holder slide that can be moved vertically via a toggle lever drive, the toggle lever drive of which is derived from the crankshaft via an intermediate drive which is essentially horizontally movable comprises the pull and push rod engaging the toggle lever, a double arm lever articulated to the pull and push rod, an articulated lever located between the double arm lever and the crankshaft and an auxiliary lever which normally rests against a stop point under spring pressure and thus prevents a dead center passage the normal position of the stop point, from which it swings out against the spring force when the normal clamping pressure is exceeded, characterized in that the auxiliary lever as a double-arm lever (28) in the intermediate drive between the double-arm lever (25) on the crankshaft side and the pull and push rod (27) is articulated, that the stop (29) for the hinge point (25/28) is fixedly arranged on the pull and push rod (27) and that the one hand on the pulling and spring device (30, 31) engaging the push rod (27), on the other hand, to the articulation point of the double arm lever (28) lying in the normal position above the axis of the pull and push rod (27) between the stop point (29) and the articulation point to the pull and push rod (27) attacks. 2. Horizontal forging or upsetting machine according to claim 1, characterized in that a pressure medium device (30, 31) is provided in place of the spring device in a known manner. Considered publications:
German utility model No. 1 826 030;
U.S. Patents Nos. 2,682,186, 2,121,119, 975,537;
"Werkstattstechnik" magazine, issue 8/1959, p. 461 to 468. 1 sheet of drawings 709 579/237 5.67 Bundesdruckerei Berlin