US3834216A

US3834216A - Forging press

Info

Publication number: US3834216A
Application number: US00374221A
Authority: US
Inventors: W Schiller; P Obladen; L Peters
Original assignee: Eumuco AG fuer Maschinenbau
Current assignee: Eumuco AG fuer Maschinenbau
Priority date: 1972-06-28
Filing date: 1973-06-27
Publication date: 1974-09-10
Anticipated expiration: 1991-09-10
Also published as: DE2231579A1; FR2190546A1; GB1431494A; IT989463B; FR2190546B1; JPS5516739B2; DE2231579B2; DE2231579C3; JPS4952751A

Abstract

A pressure transmitting means is disposed between the pressure rod and the slide or ram member of a forging press. The pressure transmitting means has over its entire width in the lower zone thereof facing in a direction toward the slide member, a diameter different from another diameter in the upper zone which faces in a direction toward the pressure rod. The diameters are offset with respect to each other on one side of the transmitting means and are in contact with each other on the other side of the transmitting means. The pressure rod is connected to the pressure transmitting means which is a pin member in a specific embodiment so that forces acting eccentrically on the slide or rod member can be rectilinearly transmitted to the eccentric crankshaft of the forging press by the slide or ram member and the pressure rod.

Description

United States Patent [1 1 Schiller et al.

[ 51 Sept. 10, 1974 1 F ORGING PRESS [73] Assignee: Eumuco Aktiengesellschaft fur Maschinebau, Leverkusen, Germany 221 Filed: June 27, 1973 21 Appl. No.: 374,221

[30] Foreign Application Priority Data Germany 72/446 ltaly 100/257 Primary Examiner-Charles W. Lanham Assistant Examiner-Gene P. Crosby Attorney, Agent, or Firm-Markva & Smith [57] ABSTRACT A pressure transmitting means is disposed between the pressure rod and the slide or ram member of a forging press. The pressure transmitting means has over its entire width in the lower zone thereof facing in a direction toward the slide member, a diameter different from another diameter in the upper zone which faces in a direction toward the pressure rod. The diameters are offset with respect to each other on one side of the transmitting means and are in contact with each other on the other side of the transmitting means. The pressure rod is connected to the pressure transmitting means which is a pin member in a specific embodiment so that forces acting eccentrically on the slide or rod member can be rectilinearly transmitted to the eccentric crankshaft of the forging press by the slide or ram member and the pressure rod.

12 Claims, 4 Drawing Figures PATENIEDSEPIOIQH 3.834.216

SHEH'I 0f 4 FIG. 1

FORGING PRESS BACKGROUND OF THE INVENTION The invention relates to a forging press having a device for adjusting the stroke position of the slide or ram member which carries the forging tool. In particular, the invention is directed to a drop forging press having a driven crankshaft including an eccentric portion, a pressing rod and guides or rams which carry the forging tool.

It is well known to incorporate key adjusting arrangements in the press table of drop forging presses for the purpose of adjusting the pressing or forging tool in the pressing direction. It is also known to adjust the stroke position of the slide or ram member in eccentric forging presses. In these prior art configurations, column bearings of the eccentric shaft are adjusted to effectuate the desired stroke position variation. These bearing elements are of eccentric design. By rotating the adjusting eccentric, the position of the eccentric shaft with respect to the column can be varied.

Such a design is possible only in the case of eccentric presses having no back or intermediate gearing. Furthermore, the adjustment of an eccentric sleeve arranged in the pressure rod and engaging about the eccentric shaft is known. This prior art arrangement has the disadvantage that the eccentric sleeve becomes extremely large and therefore extremely costly. Initially, the pressure rod in the zone of the eccentric shaft performs a compound movement incorporating a rotary movement and a reciprocating movement. The actuating elements of this adjustment arrangement accompany this compound movement. Therefore, connection of a motor adjustment means is extremely difiicult.

Where it is desired to effectuate a stroke position adjustment of an eccentric press, the eccentric sleeve is adjustably mounted about a pin arranged in the slide or ram member. Consequently, the forces which are transmitted from the eccentric shaft via the pressure rod to the slide member have to be discharged via the slide pin which is thereby subjected to bending stresses. Furthermore, it is disadvantageous that the pressure rod must be designed to be relatively narrow in view of the mounting on both sides of the pin.

In this latter prior art arrangement, when there is considerable eccentric stressing of the slide member, the corresponding forces are not rectilinearly deflected to the slide member, the pressure rod and the eccentric shaft. The result of this is a tilting moment on the slide member which results in increased edge stressing of the slide guideway and therewith inaccuracy during forging due to the tilting of the slide. These disadvantageous effects would not be eliminated even if an eccentric pin, the diameter of which is eccentrically offset in the pressure zone with respect to the particular diameters on the righthand and lefthand side in the slide zone, were used instead of the eccentric sleeve.

PURPOSE OF THE INVENTION The primary object of this invention is to provide an assembly or structural combination for effecting the stroke position adjustment for the slide or ram member of forging presses and the like.

A further object of this invention is to provide a stroke position adjustment mechanism having a stronger and wider design of the pressure rod and the slide member so that the elements are uniformly stressed and any possibility of a tilting moment being set up within the forging press is obviated.

SUMMARY OF THE INVENTION These objects and other advantages may be accomplished through the use of the forging press as disclosed herein. The forging press includes a mechanism or device for varying the stroke position of the slide or ram member with respect to the press table. This device includes an adjustable, pivotal eccentric element and a device for arresting the same. The mechanism includes a pressure transmitting pin which is disposed between the pressure rod and the slide member. The pressure transmitting pin has, over the entire width in the lower zone facing toward the slide member, a diameter differing from another diameter in the upper zone which faces toward the pressure rod. Both diameters are offset with respect to each other on one side of the pin and contact each other on the other side of the pin. The pressure transmitting pin includes pin studs which are located at each end thereof and are engaged by projections disposed on the pressure rod.

Due to the arrangement of the specially shaped pressure transmitting pin between the pressure rod and the slide member, the transmission pin permits the construction of a pressure rod mounting at the slide which extends over the entire width of the slide. Consequently, forces acting eccentrically on the slide member can be rectilinearly transmitted to the eccentric shaft by the slide and the pressure rod. Tilting of the slide or ram member is reliably prevented. Furthermore, no bending stress is set up in the pressure transmitting pin. The essential factor with the adjusting pin is that the diffemet diameters necessary for adjustment and having eccentric position with respect to each other are not arranged juxtaposed in the longitudinal axis. The center points for the different diameters are laterally displaced with respect to each other.

Another feature of the invention incorporates the use of a clamping bow between the slide member and the pressure transmitting pin for arresting the adjusting device. The clamping bow is adapted to be tensioned on the pressure transmitting pin by means of balancing or compensating cylinders. In a specific embodiment, the clamping bow is arranged in the central transverse plane of the pressure transmitting pin. The clamping bow constitutes a reliable and safe means for tensioning the pressure transmitting pin and for maintaining the angular position which has been set on the pressure transmitting pin. In detail, the arrangement may be such that one of the balancing cylinders engages on the clamping bow via a bell crank lever and the other via a cantilever arm.

The adjusting device which is used for adjusting the pressure transmitting pin expediently acts on the lower zone of the transmitting pin and is advantageously mounted in the slide or ram member which carries the forging tool.

BRIEF DESCRIPTION OF DRAWINGS Other objects of this invention will appear in the following description and appended claims, reference being made to the accompanying drawings forming a part of the specification wherein like reference characters designate corresponding parts in the several views.

FIG. 1 is a diagramatic elevational view of a forging press made in accordance with this invention,

FIG. 2 is a diagramatic elevational view partly in section of the forging press in FIG. 1 showing the adjustment mechanism for varying the stroke position of the slide or ram member,

FIG. 3 is a longitudinal sectional view taken along the line III-III of FIG. 2, and

FIG. 4 is a fragmentary sectional view taken along the line IV-IV of FIG. 3.

DESCRIPTION OF SPECIFIC EMBODIMENTS More specifically, reference being made to the drawings, the forging press, generally designated 1, has a driven crankshaft 2 which is mounted in the upright frame structure 3. The motor 4 drives the crankshaft 2 by means of the transmission belt 5 with the interposition of a flywheel 6 and a coupling or clutch (not shown). Intermediate gearing may be interposed. The eccentric crankshaft 2 has an eccentric portion 7 surrounded by a pressure rod 8 acting on the slide or ram member 9 which carries the upper tool of the forging press. The lower tool of the forging press is secured on the platen 10.

A pressure transmitting means includes a pin 11 which is disposed between the pressure rod 8 and the slide member 9. The pin 11 extends over the entire width of the slide member 9. The continuous pin 11 has a first diameter or radius in the lower zone thereof which faces toward the slide member 9 over the entire width different than another diameter located in the upper zone of the pin and facing toward the pressure rod 8. The center point 12 is for the radius 14 located in the lower zone of the pin 11. The center point 13 is for the radius 15 in the upper zone of the pin 11. The

center points

12 and 13 are offset with respect to each other and are laterally displaced for a spacing or gap 16. Both of the diameters or radii from the center points 12 and 13 contact each other on one side of the pressure transmission pin 11. See the righthand side of pin 11 when viewing FIG. 2. There is a step or transition location 17 on the opposite side in the surface of the pin 11. That is, the diameters or radii l4 and 15 are offset with respect to each other on the other side of the pin. The step or transition location 17 has a value of twice the amount of eccentricity or spacing 16 of both diameters.

Studs 11a are located at the end faces of the pressure transmitting pin 11 and have a rotational axis located at the center point 13 of the studs 11a. The pressure rod 8 includes projections 80 which engage the studs 11a as shown in FIG. 3. The pressure rod 8 has a concave design above the upper zone of the pressure transmitting pin 11 which engages the pressure rod 8 as shown in FIG. 4.

The connection between the pressure rod 8 and the pressure transmitting pin 11 is established by the projections 8a. A bowed clamping member 18 is pivotably mounted on the slide member 9 and is movable between a clamping position and an unclamped position. The bowed member 18 is used for effecting connection between the slide member 9 and the pressure transmittingpin 11 in the pull-back direction. The bowed member 18 has simultaneously the task of jamming the pressure transmitting pin 11 fast in its position set with the adjustment during the operation of the press. For this purpose, the clamping bow 18 is tensioned or secured on the pressure transmitting pin 11 with the aid of balancing cylinders 19.

The arresting mechanism includes means to effect movement of the clamping member 18 between the clamping position and an unclamped position. The moving means includes balancing

cylinders

19 and 19a for effecting movement of the clamping bow 18 around its pivot point. The tensioning or securing of the clamping bow 18 can be effected on one side of the bowed member 18 by means of a bell crank lever 20 mounted to pivot around the shaft 21. The piston rod 22 of the cylinder 19 engages the free end of the bell crank lever 20 to effect the pivotal movement of the bell crank lever 20. The clamping bow 18 is mounted to pivot on the shaft 23 which is mounted in the slide 19. The clamping bow 18 has a cantilever arm 18a to which the piston rod 24 of the other balancing cylinder 19a is articulated. The clamping bow 18 is expediently disposed in the central transverse plane of the pressure transmitting pin 11.

An adjusting device, generally designated 25, is mounted to pivot within the slide member 9 and to cooperate with the lower zone of the transmitting pin 11. For this purpose, the pin 11 includes a worm toothing 26 formed in its lower zone to mesh with the worm 27 which constitutes a portion of the adjusting device 25. The adjusting device 25 may be actuated either manually or with the aid of an electrical, pneumatic or hydraulic motor.

In operation, the balancing

cylinders

19 and 19a are vented by way of a valve (not shown) which is, for example, manually operated whereby the clamping effect of the clamping bow 18 is eliminated. On actuation of the adjusting device 25, the pressure transmitting pin 11 rotates about its central axis 12 and the slide stroke position changes. After adjustment has been effected, the balancing

cylinders

19 and 19a are again subjected to action. Consequently, the pressure transmitting pin 11 is tensioned in its adjusted position through the action of the

cylinders

19 and 19a on the

rods

22 and 24, respectively, so that the clamping bow 18 pivots in a counterclockwise direction around the shaft 23 as shown in FIG. 2.

The primary function of the balancing

cylinders

19 and 19a is to prestress the slide member 9 which carries the tool and the pressure rod 8 and also, optionally, the eccentric rod shaft 2 in the loading directionof the press. The supplementary function is to effect tensioning of the pressure transmitting pin 11. The primary function is not detrimentally affected due to the supplementary function.

While the forging press has been shown and described in detail, it is obvious that this invention is not to be considered as being limited to the exact form disclosed, and that changes in detail and construction may be made therein within the scope of the invention, without departing from the spirit thereof.

Having thus set forth and disclosed the nature of this invention, what is claimed is:

1. In a forging press having a driven crankshaft including an eccentric portion, a pressure rod, a slide or ram member which carries the forging tool, an adjustment mechanism for varying the stroke position of the slide member with respect to the platen and means for arresting said adjustment mechanism, the combination comprising:

a. a pressure transmitting means disposed between the pressure rod and the slide member,

b. said pressure transmitting means having, in the lower zone facing in a direction toward the slide member, a first diameter different from another diameter in the upper zone facing in a direction toward the pressure rod,

c. said diameters being offset with respect to each other on one side of the transmitting means and being in contact with each other on the other side of said means, and

d. means for connecting the transmitting means to the pressure rod.

2. In a forging press as defined in claim 1 wherein said pressure transmitting means includes a pin member having pin studs disposed at each end thereof and the first diameter extending over its entire width in the lower zone thereof.

3. In a forging press as defined in claim 2 wherein said connecting means includes projections which engage the pin studs,

said projections being disposed on the pressure rod which extends in length over the entire width of the pm.

4. In a forging press as defined in claim 2 wherein the adjusting mechanism is mounted on the slide member and acts on the lower zone of the pressure transmitting pin for rotating said pin about its axis of rotation.

5. In a forging press as defined in claim 1 wherein said arresting means includes balancing cylinders and a clamping bow adapted to be tensioned on the pressure transmitting means by the balancing cylinders. v

6. In a forging press as defined in claim 1 wherein said arresting means includes a clamping bow arranged in the central transverse plane of the pressure transmitting means.

7. In a forging press as defined in claim 1 wherein said arresting device includes a clamping bow and means for effecting the movement of the clamping bow between a clamping position and an unclamped position.

8. In a forging press as defined in claim 1 wherein said arresting means includes a means for clamping the pressure transmitting means into a fixed clamping position and means for moving the clamping means between a clamping position and an unclamped position.

9. In a forging press as defined in claim 8 wherein said moving means includes balancing cylinders.

10. A device as defined in claim 8 wherein said clamping means is pivotally movable around a pivot point located on the slide member and said moving means includes balancing cylinders for effectuating movement of the clamping means around its pivot point.

11. In a forging press as defined in claim 8 wherein said clamping means includes a pivotally mounted clamping bow having a cantilever arm connected to one side thereof,

said arresting means includes a bell crank lever acting on the other side of the clamping bow so that a force on either the bell crank lever or the cantilever arm will tend to pivot the clamping bow about its pivot point.

12. In a forging press as defined in claim 11 wherein said moving means includes balancing cylinders and a means for connecting a first cylinder to operate the bell crank lever and a second cylinder to act on the cantilever arm.

UNITED STATES PATENT OFFIC CERTIFICATE OF. CORRECTION Patent No. 216 Dated Sept. 10, 1974 Werner Schiller, Peter Obladen, Leonhard Peters It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

Column 1, line 10, the priority date should read June- 28, 1972-- Signed and sealed this 24th day of December 1974.

(SEAL) Attest:

MCCOY M. GIBSON JR.. C. MARSHALL DANN Attesting Officer Commissioner of Patents FORM powso I uscoMM-oc GO376-P69 I LL5- GOVERNMENT PRINTING OFFICE: 9.9 0-356-33

Claims

1. In a forging press having a driven crankshaft including an eccentric portion, a pressure rod, a slide or ram member which carries the forging tool, an adjustment mechanism for varying the stroke position of the slide member with respect to the platen and means for arresting said adjustment mechanism, the combination comprising: a. a pressure transmitting means disposed between the pressure rod and the slide member, b. said pressure transmitting means having, in the lower zone facing in a direction toward the slide member, a first diameter different from another diameter in the upper zone facing in a direction toward the pressure rod, c. said diameters being offset with respect to each other on one side of the transmitting means and being in contact with each other on the other side of said means, and d. means for connecting the transmitting means to the pressure rod.

3. In a forging press as defined in claim 2 wherein said connecting means includes projections which engage the pin studs, said projections being disposed on the pressure rod which extends in length over the entire width of the pin.

5. In a forging press as defined in claim 1 wherein said arresting means includes balancing cylinders and a clamping bow adapted to be tensioned on the pressure transmitting means by the balancing cylinders.

11. In a forging press as defined in claim 8 wherein said clamping means includes a pivotally mounted clamping bow having a cantilever arm connected to one side thereof, said arresting means includes a bell crank lever acting on the other side of the clamping bow so that a force on either the bell crank lever or the cantilever arm will tend to pivot the clamping bow about its pivot point.