Forging machine

Details Forging machine Forging machine

1999-12-02

2001-10-30

Jones, David (Department: 3725)

Metal deforming

With means to drive tool

Including cam-actuated support

C072S402000

Reexamination Certificate

active

06308552

ABSTRACT:

FIELD OF THE INVENTION
This invention relates to a forging machine with eccentric-driven connecting rods, which are guided in a forging box so as to be reciprocable in a radial direction relative to the eccentric shaft axis, and an eccentric drive connection including a head at the connecting rod end with a sliding surface facing the eccentric for a non-rotating sliding cooperation with a bearing body rotatably seated on the eccentric.
DESCRIPTION OF THE PRIOR ART
Forging machines with eccentric-driven connecting rods have turned out to be very useful in all kinds of embodiments, but for adjusting the stroke of the connecting rods special adjustment housings must be provided for supporting the eccentric shaft. This weakens the rigidity of the machine frame due to the required bearing lugs, and due to the displacement of the center of the eccentric shaft during the adjustment, a corresponding eccentric shaft drive compensating this displacement is required. It has also been proposed that for adjusting the stroke of the connecting rods to compose them of two parts screwed together, one part being non-rotatably guided with respect to the forging box and the other rotatably guided. The rotatable part is connected to a rotary drive, so that a rotation of the rotatable part effects a change in the length of the connecting rod and thus an adjustment of the stroke. However, this means for adjusting the stroke still remains rather complex and impairs the load-bearing capacity of the connecting rods due to their division.
SUMMARY OF THE INVENTION
It is, therefore, the object of the present invention to create a forging machine as described above, which is characterized by its particularly simple and rugged means for adjusting the stroke.
This object is solved by the invention with a forging machine comprising a forging box, a plurality of connecting rods, each connecting rod having an axis and carrying a forging tool at one end thereof, an eccentric drive for driving each connecting rod in a reciprocating motion. The drive includes a shaft having an axis and comprising an eccentric, the reciprocating motion extending radially to the eccentric shaft axis and the connecting rod being supported against axial displacement, a bearing body rotatably and axially displaceably mounted on the eccentric, and a head at an end of the connecting rod opposite to the one end, the bearing body and the connecting rod head having corresponding inclined surfaces in non-rotating and sliding engagement to form a sliding path which is inclined to the axis of the shaft and extends in a plane extending perpendicularly to a plane defined by the axes of the connecting rod and the shaft. An actuator is provided for axially displacing the bearing body. The bearing body and connecting rod, therefore, cooperate like a spline-and-wedge transmission so that an axial displacement of the bearing body due to the resulting relative movement between the inclined surfaces along the sliding path leads to a displacement of the connecting rod in the axial direction of the connecting rod and there is necessarily obtained the desired adjustment of the stroke. The bearing body at the same time serves to effect a drive and operating connection between eccentric shaft and connecting rod, which provides for a compact, high-duty and nevertheless inexpensive construction.
For displacing the bearing bodies, suitable actuators can directly engage the bearing bodies and move the same with respect to the connecting rod and the eccentric. However, the bearing body is advantageously displaceable on the eccentric, and the actuator acts on the axially movable eccentric shaft, so that more favorable mounting conditions are obtained for the actuator.
The inventive adjustment of the stroke similar to a spline-and-wedge transmission can be employed with all eccentric-driven connecting rods, independent of whether the connecting rod head encloses an eccentric and/or the bearing body, i.e., whether there is a unilateral coupling between the connecting rod head and a guide rail of the bearing body in accordance with AT 370,351 B or only a frictional connection between the connecting rod head and the bearing body in accordance with EP 0 667 197 A. When the connecting rod head and a sliding pad seated on the eccentric cooperate in the manner of a cross loop to provide a drive connection, the bearing body can advantageously be a sliding pad received with a transverse clearance in the recess of the connecting rod head forming a connecting link guide, whereby the bearing body at the same time serves as sliding pad of the cross loop and performs a double function in an economic way.
The means for adjusting the stroke in accordance with the invention can not only be used for forging machines with an upright forging box, but also for forging machines employed as rotary kneading machines, where the forging box is mounted in a machine frame so as to be rotated and driven about a forging axis parallel to the eccentric shaft axes. It is particularly advantageous when a common actuator is provided for all eccentric shafts, which comprises a screw drive including an adjusting nut mounted on the forging box coaxially with the forging axis, the adjusting nut being non-rotatable but displaceable and having an entrainment element in non-displaceable but rotatable engagement with the shafts, and a drivable gear rim meshing with the adjusting nut. By rotating the gear rim, the adjusting nut is moved axially, and by means of this movement, the entrainment element can at the same time move the eccentric shafts, which induces a synchronous adjustment of the stroke for all connecting rods.


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patent: 370 351 (1983-03-01), None
patent: 24 11 340 (1975-09-01), None
patent: 0 667 197 A1 (1995-08-01), None

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